scala.collection.mutable

Stack

class Stack[A] extends AbstractSeq[A] with Seq[A] with SeqLike[A, Stack[A]] with GenericTraversableTemplate[A, Stack] with Cloneable[Stack[A]] with Serializable

A stack implements a data structure which allows to store and retrieve objects in a last-in-first-out (LIFO) fashion.

A

type of the elements contained in this stack.

Source
Stack.scala
Version

2.8

Since

1

See also

"Scala's Collection Library overview" section on Stacks for more information.

Linear Supertypes
Serializable, java.io.Serializable, AbstractSeq[A], Seq[A], SeqLike[A, Stack[A]], Cloneable[Stack[A]], scala.Cloneable, java.lang.Cloneable, Iterable[A], Traversable[A], Mutable, collection.AbstractSeq[A], collection.Seq[A], collection.SeqLike[A, Stack[A]], GenSeq[A], GenSeqLike[A, Stack[A]], PartialFunction[Int, A], (Int) ⇒ A, collection.AbstractIterable[A], collection.Iterable[A], IterableLike[A, Stack[A]], Equals, GenIterable[A], GenIterableLike[A, Stack[A]], AbstractTraversable[A], collection.Traversable[A], GenTraversable[A], GenericTraversableTemplate[A, Stack], TraversableLike[A, Stack[A]], GenTraversableLike[A, Stack[A]], Parallelizable[A, ParSeq[A]], TraversableOnce[A], GenTraversableOnce[A], FilterMonadic[A, Stack[A]], HasNewBuilder[A, Stack[A]], AnyRef, Any
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Inherited
  1. Stack
  2. Serializable
  3. Serializable
  4. AbstractSeq
  5. Seq
  6. SeqLike
  7. Cloneable
  8. Cloneable
  9. Cloneable
  10. Iterable
  11. Traversable
  12. Mutable
  13. AbstractSeq
  14. Seq
  15. SeqLike
  16. GenSeq
  17. GenSeqLike
  18. PartialFunction
  19. Function1
  20. AbstractIterable
  21. Iterable
  22. IterableLike
  23. Equals
  24. GenIterable
  25. GenIterableLike
  26. AbstractTraversable
  27. Traversable
  28. GenTraversable
  29. GenericTraversableTemplate
  30. TraversableLike
  31. GenTraversableLike
  32. Parallelizable
  33. TraversableOnce
  34. GenTraversableOnce
  35. FilterMonadic
  36. HasNewBuilder
  37. AnyRef
  38. Any
Implicitly
  1. by traversable2ops
  2. by MonadOps
  3. by any2stringadd
  4. by any2stringfmt
  5. by any2ArrowAssoc
  6. by any2Ensuring
  7. by alternateImplicit
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Instance Constructors

  1. new Stack()

Type Members

  1. type Self = Stack[A]

    The type implementing this traversable

    The type implementing this traversable

    Attributes
    protected
    Definition Classes
    TraversableLike
  2. class WithFilter extends FilterMonadic[A, Repr]

    A class supporting filtered operations.

Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  2. final def !=(arg0: Any): Boolean

    Test two objects for inequality.

    Test two objects for inequality.

    returns

    true if !(this == that), false otherwise.

    Definition Classes
    Any
  3. final def ##(): Int

    Equivalent to x.hashCode except for boxed numeric types and null.

    Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  4. def +(other: String): String

    Implicit information
    This member is added by an implicit conversion from Stack[A] to StringAdd performed by method any2stringadd in scala.Predef.
    Definition Classes
    StringAdd
  5. def ++[B](that: GenTraversableOnce[B]): Stack[B]

    [use case] Returns a new stack containing the elements from the left hand operand followed by the elements from the right hand operand.

    [use case]

    Returns a new stack containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the stack is the most specific superclass encompassing the element types of the two operands.

    Example:

    scala> val a = LinkedList(1)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1)
    
    scala> val b = LinkedList(2)
    b: scala.collection.mutable.LinkedList[Int] = LinkedList(2)
    
    scala> val c = a ++ b
    c: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
    
    scala> val d = LinkedList('a')
    d: scala.collection.mutable.LinkedList[Char] = LinkedList(a)
    
    scala> val e = c ++ d
    e: scala.collection.mutable.LinkedList[AnyVal] = LinkedList(1, 2, a)
    B

    the element type of the returned collection.

    that

    the traversable to append.

    returns

    a new stack which contains all elements of this stack followed by all elements of that.

    Definition Classes
    TraversableLikeGenTraversableLike
    Full Signature

    def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  6. def ++:[B >: A, That](that: collection.Traversable[B])(implicit bf: CanBuildFrom[Stack[A], B, That]): That

    As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

    As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

    It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.

    Example:

    scala> val x = List(1)
    x: List[Int] = List(1)
    
    scala> val y = LinkedList(2)
    y: scala.collection.mutable.LinkedList[Int] = LinkedList(2)
    
    scala> val z = x ++: y
    z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)

    This overload exists because: for the implementation of ++: we should reuse that of ++ because many collections override it with more efficient versions.

    Since TraversableOnce has no ++ method, we have to implement that directly, but Traversable and down can use the overload.

    B

    the element type of the returned collection.

    That

    the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type B being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, B, That] is found.

    that

    the traversable to append.

    bf

    an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.

    returns

    a new collection of type That which contains all elements of this stack followed by all elements of that.

    Definition Classes
    TraversableLike
  7. def ++:[B](that: TraversableOnce[B]): Stack[B]

    [use case] As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

    [use case]

    As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

    It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.

    Example:

    scala> val x = List(1)
    x: List[Int] = List(1)
    
    scala> val y = LinkedList(2)
    y: scala.collection.mutable.LinkedList[Int] = LinkedList(2)
    
    scala> val z = x ++: y
    z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
    B

    the element type of the returned collection.

    that

    the traversable to append.

    returns

    a new stack which contains all elements of this stack followed by all elements of that.

    Definition Classes
    TraversableLike
    Full Signature

    def ++:[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  8. def +:(elem: A): Stack[A]

    [use case] A copy of the stack with an element prepended.

    [use case]

    A copy of the stack with an element prepended.

    Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

    Also, the original stack is not modified, so you will want to capture the result.

    Example:

    scala> val x = LinkedList(1)
    x: scala.collection.mutable.LinkedList[Int] = LinkedList(1)
    
    scala> val y = 2 +: x
    y: scala.collection.mutable.LinkedList[Int] = LinkedList(2, 1)
    
    scala> println(x)
    LinkedList(1)
    elem

    the prepended element

    returns

    a new stack consisting of elem followed by all elements of this stack.

    Definition Classes
    SeqLikeGenSeqLike
    Full Signature

    def +:[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  9. def ->[B](y: B): (Stack[A], B)

    Implicit information
    This member is added by an implicit conversion from Stack[A] to ArrowAssoc[Stack[A]] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  10. def /:[B](z: B)(op: (B, A) ⇒ B): B

    Applies a binary operator to a start value and all elements of this stack, going left to right.

    Applies a binary operator to a start value and all elements of this stack, going left to right.

    Note: /: is alternate syntax for foldLeft; z /: xs is the same as xs foldLeft z.

    Examples:

    Note that the folding function used to compute b is equivalent to that used to compute c.

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = (5 /: a)(_+_)
    b: Int = 15
    
    scala> val c = (5 /: a)((x,y) => x + y)
    c: Int = 15
    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this stack, going left to right with the start value z on the left:

    op(...op(op(z, x_1), x_2), ..., x_n)

    where x1, ..., xn are the elements of this stack.

    Definition Classes
    TraversableOnceGenTraversableOnce
  11. def :+(elem: A): Stack[A]

    [use case] A copy of this stack with an element appended.

    [use case]

    A copy of this stack with an element appended.

    A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

    Example:

    scala> import scala.collection.mutable.LinkedList
    import scala.collection.mutable.LinkedList
    
    scala> val a = LinkedList(1)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1)
    
    scala> val b = a :+ 2
    b: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
    
    scala> println(a)
    LinkedList(1)
    elem

    the appended element

    returns

    a new stack consisting of all elements of this stack followed by elem.

    Definition Classes
    SeqLikeGenSeqLike
    Full Signature

    def :+[B >: A, That](elem: B)(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  12. def :\[B](z: B)(op: (A, B) ⇒ B): B

    Applies a binary operator to all elements of this stack and a start value, going right to left.

    Applies a binary operator to all elements of this stack and a start value, going right to left.

    Note: :\ is alternate syntax for foldRight; xs :\ z is the same as xs foldRight z.

    Examples:

    Note that the folding function used to compute b is equivalent to that used to compute c.

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = (a :\ 5)(_+_)
    b: Int = 15
    
    scala> val c = (a :\ 5)((x,y) => x + y)
    c: Int = 15
    B

    the result type of the binary operator.

    z

    the start value

    op

    the binary operator

    returns

    the result of inserting op between consecutive elements of this stack, going right to left with the start value z on the right:

    op(x_1, op(x_2, ... op(x_n, z)...))

    where x1, ..., xn are the elements of this stack.

    Definition Classes
    TraversableOnceGenTraversableOnce
  13. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  14. final def ==(arg0: Any): Boolean

    Test two objects for equality.

    Test two objects for equality. The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    Any
  15. def addString(b: scala.StringBuilder): scala.StringBuilder

    Appends all elements of this stack to a string builder.

    Appends all elements of this stack to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this stack without any separator string.

    Example:

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> val h = a.addString(b)
    b: StringBuilder = 1234
    b

    the string builder to which elements are appended.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    TraversableOnce
  16. def addString(b: scala.StringBuilder, sep: String): scala.StringBuilder

    Appends all elements of this stack to a string builder using a separator string.

    Appends all elements of this stack to a string builder using a separator string. The written text consists of the string representations (w.r.t. the method toString) of all elements of this stack, separated by the string sep.

    Example:

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> a.addString(b, ", ")
    res0: StringBuilder = 1, 2, 3, 4
    b

    the string builder to which elements are appended.

    sep

    the separator string.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    TraversableOnce
  17. def addString(b: scala.StringBuilder, start: String, sep: String, end: String): scala.StringBuilder

    Appends all elements of this stack to a string builder using start, end, and separator strings.

    Appends all elements of this stack to a string builder using start, end, and separator strings. The written text begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this stack are separated by the string sep.

    Example:

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> a.addString(b, "LinkedList(", ", ", ")")
    res1: StringBuilder = LinkedList(1, 2, 3, 4)
    b

    the string builder to which elements are appended.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    TraversableOnce
  18. def aggregate[B](z: B)(seqop: (B, A) ⇒ B, combop: (B, B) ⇒ B): B

    Aggregates the results of applying an operator to subsequent elements.

    Aggregates the results of applying an operator to subsequent elements.

    This is a more general form of fold and reduce. It has similar semantics, but does not require the result to be a supertype of the element type. It traverses the elements in different partitions sequentially, using seqop to update the result, and then applies combop to results from different partitions. The implementation of this operation may operate on an arbitrary number of collection partitions, so combop may be invoked an arbitrary number of times.

    For example, one might want to process some elements and then produce a Set. In this case, seqop would process an element and append it to the list, while combop would concatenate two lists from different partitions together. The initial value z would be an empty set.

    pc.aggregate(Set[Int]())(_ += process(_), _ ++ _)

    Another example is calculating geometric mean from a collection of doubles (one would typically require big doubles for this).

    B

    the type of accumulated results

    z

    the initial value for the accumulated result of the partition - this will typically be the neutral element for the seqop operator (e.g. Nil for list concatenation or 0 for summation)

    seqop

    an operator used to accumulate results within a partition

    combop

    an associative operator used to combine results from different partitions

    Definition Classes
    TraversableOnceGenTraversableOnce
  19. def andThen[C](k: (A) ⇒ C): PartialFunction[Int, C]

    Composes this partial function with a transformation function that gets applied to results of this partial function.

    Composes this partial function with a transformation function that gets applied to results of this partial function.

    C

    the result type of the transformation function.

    k

    the transformation function

    returns

    a partial function with the same domain as this partial function, which maps arguments x to k(this(x)).

    Definition Classes
    PartialFunctionFunction1
  20. def apply(index: Int): A

    Retrieve n-th element from stack, where top of stack has index 0.

    Retrieve n-th element from stack, where top of stack has index 0.

    This is a linear time operation.

    index

    the index of the element to return

    returns

    the element at the specified index

    Definition Classes
    StackSeqLikeGenSeqLikeFunction1
    Exceptions thrown
    IndexOutOfBoundsException

    if the index is out of bounds

  21. def applyOrElse[A1 <: Int, B1 >: A](x: A1, default: (A1) ⇒ B1): B1

    Applies this partial function to the given argument when it is contained in the function domain.

    Applies this partial function to the given argument when it is contained in the function domain. Applies fallback function where this partial function is not defined.

    Note that expression pf.applyOrElse(x, default) is equivalent to

    if(pf isDefinedAt x) pf(x) else default(x)

    except that applyOrElse method can be implemented more efficiently. For all partial function literals compiler generates applyOrElse implementation which avoids double evaluation of pattern matchers and guards. This makes applyOrElse the basis for the efficient implementation for many operations and scenarios, such as:

    • combining partial functions into orElse/andThen chains does not lead to excessive apply/isDefinedAt evaluation
    • lift and unlift do not evaluate source functions twice on each invocation
    • runWith allows efficient imperative-style combining of partial functions with conditionally applied actions

    For non-literal partial function classes with nontrivial isDefinedAt method it is recommended to override applyOrElse with custom implementation that avoids double isDefinedAt evaluation. This may result in better performance and more predictable behavior w.r.t. side effects.

    x

    the function argument

    default

    the fallback function

    returns

    the result of this function or fallback function application.

    Definition Classes
    PartialFunction
    Since

    2.10

  22. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown
    ClassCastException

    if the receiver object is not an instance of the erasure of type T0.

  23. def asParIterable: ParIterable[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  24. def asParSeq: ParSeq[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  25. def canEqual(that: Any): Boolean

    Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.

    Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.

    that

    The object with which this stack should be compared

    returns

    true, if this stack can possibly equal that, false otherwise. The test takes into consideration only the run-time types of objects but ignores their elements.

    Definition Classes
    IterableLikeEquals
  26. def clear(): Unit

    Removes all elements from the stack.

    Removes all elements from the stack. After this operation completed, the stack will be empty.

  27. def clone(): Stack[A]

    This method clones the stack.

    This method clones the stack.

    returns

    a stack with the same elements.

    Definition Classes
    StackCloneable → AnyRef
  28. def collect[B](pf: PartialFunction[A, B]): Stack[B]

    [use case] Builds a new collection by applying a partial function to all elements of this stack on which the function is defined.

    [use case]

    Builds a new collection by applying a partial function to all elements of this stack on which the function is defined.

    B

    the element type of the returned collection.

    pf

    the partial function which filters and maps the stack.

    returns

    a new stack resulting from applying the given partial function pf to each element on which it is defined and collecting the results. The order of the elements is preserved.

    Definition Classes
    TraversableLikeGenTraversableLike
    Full Signature

    def collect[B, That](pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  29. def collectFirst[B](pf: PartialFunction[A, B]): Option[B]

    Finds the first element of the stack for which the given partial function is defined, and applies the partial function to it.

    Finds the first element of the stack for which the given partial function is defined, and applies the partial function to it.

    pf

    the partial function

    returns

    an option value containing pf applied to the first value for which it is defined, or None if none exists.

    Definition Classes
    TraversableOnce
    Example:
    1. Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)

  30. def combinations(n: Int): Iterator[Stack[A]]

    Iterates over combinations.

    Iterates over combinations.

    returns

    An Iterator which traverses the possible n-element combinations of this stack.

    Definition Classes
    SeqLike
    Example:
    1. "abbbc".combinations(2) = Iterator(ab, ac, bb, bc)

  31. def companion: Stack.type

    The factory companion object that builds instances of class Stack.

    The factory companion object that builds instances of class Stack. (or its Iterable superclass where class Stack is not a Seq.)

    Definition Classes
    StackSeqIterableTraversableSeqGenSeqIterableGenIterableTraversableGenTraversableGenericTraversableTemplate
  32. def compose[A](g: (A) ⇒ Int): (A) ⇒ A

    Composes two instances of Function1 in a new Function1, with this function applied last.

    Composes two instances of Function1 in a new Function1, with this function applied last.

    A

    the type to which function g can be applied

    g

    a function A => T1

    returns

    a new function f such that f(x) == apply(g(x))

    Definition Classes
    Function1
    Annotations
    @unspecialized()
  33. def contains(elem: Any): Boolean

    Tests whether this stack contains a given value as an element.

    Tests whether this stack contains a given value as an element.

    elem

    the element to test.

    returns

    true if this stack has an element that is equal (as determined by ==) to elem, false otherwise.

    Definition Classes
    SeqLike
  34. def containsSlice[B](that: GenSeq[B]): Boolean

    Tests whether this stack contains a given sequence as a slice.

    Tests whether this stack contains a given sequence as a slice.

    that

    the sequence to test

    returns

    true if this stack contains a slice with the same elements as that, otherwise false.

    Definition Classes
    SeqLike
  35. def copyToArray(xs: Array[A], start: Int, len: Int): Unit

    [use case] Copies elements of this stack to an array.

    [use case]

    Copies elements of this stack to an array. Fills the given array xs with at most len elements of this stack, starting at position start. Copying will stop once either the end of the current stack is reached, or the end of the array is reached, or len elements have been copied.

    xs

    the array to fill.

    start

    the starting index.

    len

    the maximal number of elements to copy.

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
    Full Signature

    def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Unit

  36. def copyToArray(xs: Array[A]): Unit

    [use case] Copies values of this stack to an array.

    [use case]

    Copies values of this stack to an array. Fills the given array xs with values of this stack. Copying will stop once either the end of the current stack is reached, or the end of the array is reached.

    xs

    the array to fill.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

    def copyToArray[B >: A](xs: Array[B]): Unit

  37. def copyToArray(xs: Array[A], start: Int): Unit

    [use case] Copies values of this stack to an array.

    [use case]

    Copies values of this stack to an array. Fills the given array xs with values of this stack, beginning at index start. Copying will stop once either the end of the current stack is reached, or the end of the array is reached.

    xs

    the array to fill.

    start

    the starting index.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

    def copyToArray[B >: A](xs: Array[B], start: Int): Unit

  38. def copyToBuffer[B >: A](dest: Buffer[B]): Unit

    Copies all elements of this stack to a buffer.

    Copies all elements of this stack to a buffer.

    dest

    The buffer to which elements are copied.

    Definition Classes
    TraversableOnce
  39. def corresponds[B](that: GenSeq[B])(p: (A, B) ⇒ Boolean): Boolean

    Tests whether every element of this stack relates to the corresponding element of another sequence by satisfying a test predicate.

    Tests whether every element of this stack relates to the corresponding element of another sequence by satisfying a test predicate.

    B

    the type of the elements of that

    that

    the other sequence

    p

    the test predicate, which relates elements from both sequences

    returns

    true if both sequences have the same length and p(x, y) is true for all corresponding elements x of this stack and y of that, otherwise false.

    Definition Classes
    SeqLikeGenSeqLike
  40. def count(p: (A) ⇒ Boolean): Int

    Counts the number of elements in the stack which satisfy a predicate.

    Counts the number of elements in the stack which satisfy a predicate.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    TraversableOnceGenTraversableOnce
  41. def diff(that: collection.Seq[A]): Stack[A]

    [use case] Computes the multiset difference between this stack and another sequence.

    [use case]

    Computes the multiset difference between this stack and another sequence.

    that

    the sequence of elements to remove

    returns

    a new stack which contains all elements of this stack except some of occurrences of elements that also appear in that. If an element value x appears n times in that, then the first n occurrences of x will not form part of the result, but any following occurrences will.

    Definition Classes
    SeqLikeGenSeqLike
    Full Signature

    def diff[B >: A](that: GenSeq[B]): Stack[A]

  42. def distinct: Stack[A]

    Builds a new stack from this stack without any duplicate elements.

    Builds a new stack from this stack without any duplicate elements.

    returns

    A new stack which contains the first occurrence of every element of this stack.

    Definition Classes
    SeqLikeGenSeqLike
  43. def drop(n: Int): Stack[A]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

    n

    the number of elements to drop from this stack.

    returns

    a stack consisting of all elements of this stack except the first n ones, or else the empty stack, if this stack has less than n elements.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  44. def dropRight(n: Int): Stack[A]

    Selects all elements except last n ones.

    Selects all elements except last n ones.

    n

    The number of elements to take

    returns

    a stack consisting of all elements of this stack except the last n ones, or else the empty stack, if this stack has less than n elements.

    Definition Classes
    IterableLike
  45. def dropWhile(p: (A) ⇒ Boolean): Stack[A]

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

    returns

    the longest suffix of this stack whose first element does not satisfy the predicate p.

    Definition Classes
    TraversableLikeGenTraversableLike
  46. var elems: immutable.List[A]

  47. def endsWith[B](that: GenSeq[B]): Boolean

    Tests whether this stack ends with the given sequence.

    Tests whether this stack ends with the given sequence.

    that

    the sequence to test

    returns

    true if this stack has that as a suffix, false otherwise.

    Definition Classes
    SeqLikeGenSeqLike
  48. def ensuring(cond: (Stack[A]) ⇒ Boolean, msg: ⇒ Any): Stack[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to Ensuring[Stack[A]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  49. def ensuring(cond: (Stack[A]) ⇒ Boolean): Stack[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to Ensuring[Stack[A]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  50. def ensuring(cond: Boolean, msg: ⇒ Any): Stack[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to Ensuring[Stack[A]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  51. def ensuring(cond: Boolean): Stack[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to Ensuring[Stack[A]] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  52. final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (arg0) is a reference to the receiver object (this).

    Tests whether the argument (arg0) is a reference to the receiver object (this).

    The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:

    • It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
    • For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
    • null.eq(null) returns true.

    When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).

    returns

    true if the argument is a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  53. def equals(that: Any): Boolean

    The equals method for arbitrary sequences.

    The equals method for arbitrary sequences. Compares this sequence to some other object.

    that

    The object to compare the sequence to

    returns

    true if that is a sequence that has the same elements as this sequence in the same order, false otherwise

    Definition Classes
    GenSeqLikeEqualsAny
  54. def exists(p: (A) ⇒ Boolean): Boolean

    Tests whether a predicate holds for some of the elements of this stack.

    Tests whether a predicate holds for some of the elements of this stack.

    p

    the predicate used to test elements.

    returns

    true if the given predicate p holds for some of the elements of this stack, otherwise false.

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  55. def filter(p: (A) ⇒ Boolean): Stack[A]

    Selects all elements of this stack which satisfy a predicate.

    Selects all elements of this stack which satisfy a predicate.

    p

    the predicate used to test elements.

    returns

    a new stack consisting of all elements of this stack that satisfy the given predicate p. The order of the elements is preserved.

    Definition Classes
    TraversableLikeGenTraversableLike
  56. def filterNot(p: (A) ⇒ Boolean): Stack[A]

    Selects all elements of this stack which do not satisfy a predicate.

    Selects all elements of this stack which do not satisfy a predicate.

    p

    the predicate used to test elements.

    returns

    a new stack consisting of all elements of this stack that do not satisfy the given predicate p. The order of the elements is preserved.

    Definition Classes
    TraversableLikeGenTraversableLike
  57. def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
    Note

    not specified by SLS as a member of AnyRef

  58. def find(p: (A) ⇒ Boolean): Option[A]

    Finds the first element of the stack satisfying a predicate, if any.

    Finds the first element of the stack satisfying a predicate, if any.

    p

    the predicate used to test elements.

    returns

    an option value containing the first element in the stack that satisfies p, or None if none exists.

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  59. def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): Stack[B]

    [use case] Builds a new collection by applying a function to all elements of this stack and using the elements of the resulting collections.

    [use case]

    Builds a new collection by applying a function to all elements of this stack and using the elements of the resulting collections.

    For example:

    def getWords(lines: Seq[String]): Seq[String] = lines flatMap (line => line split "\\W+")

    The type of the resulting collection is guided by the static type of stack. This might cause unexpected results sometimes. For example:

    // lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
    def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)
    
    // lettersOf will return a Set[Char], not a Seq
    def lettersOf(words: Seq[String]) = words.toSet flatMap (word => word.toSeq)
    
    // xs will be a an Iterable[Int]
    val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2)
    
    // ys will be a Map[Int, Int]
    val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)
    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

    a new stack resulting from applying the given collection-valued function f to each element of this stack and concatenating the results.

    Definition Classes
    TraversableLikeGenTraversableLikeFilterMonadic
    Full Signature

    def flatMap[B, That](f: (A) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  60. def flatten[B]: Stack[B]

    [use case] Converts this stack of traversable collections into a stack formed by the elements of these traversable collections.

    [use case]

    Converts this stack of traversable collections into a stack formed by the elements of these traversable collections.

    The resulting collection's type will be guided by the static type of stack. For example:

    val xs = List(Set(1, 2, 3), Set(1, 2, 3))
    // xs == List(1, 2, 3, 1, 2, 3)
    
    val ys = Set(List(1, 2, 3), List(3, 2, 1))
    // ys == Set(1, 2, 3)
    B

    the type of the elements of each traversable collection.

    returns

    a new stack resulting from concatenating all element stacks.

    Definition Classes
    GenericTraversableTemplate
    Full Signature

    def flatten[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Stack[B]

  61. def fold[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1

    Folds the elements of this stack using the specified associative binary operator.

    Folds the elements of this stack using the specified associative binary operator.

    The order in which operations are performed on elements is unspecified and may be nondeterministic.

    A1

    a type parameter for the binary operator, a supertype of A.

    z

    a neutral element for the fold operation; may be added to the result an arbitrary number of times, and must not change the result (e.g., Nil for list concatenation, 0 for addition, or 1 for multiplication.)

    op

    a binary operator that must be associative

    returns

    the result of applying fold operator op between all the elements and z

    Definition Classes
    TraversableOnceGenTraversableOnce
  62. def foldLeft[B](z: B)(op: (B, A) ⇒ B): B

    Applies a binary operator to a start value and all elements of this stack, going left to right.

    Applies a binary operator to a start value and all elements of this stack, going left to right.

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this stack, going left to right with the start value z on the left:

    op(...op(z, x_1), x_2, ..., x_n)

    where x1, ..., xn are the elements of this stack.

    Definition Classes
    TraversableOnceGenTraversableOnce
  63. def foldRight[B](z: B)(op: (A, B) ⇒ B): B

    Applies a binary operator to all elements of this stack and a start value, going right to left.

    Applies a binary operator to all elements of this stack and a start value, going right to left.

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this stack, going right to left with the start value z on the right:

    op(x_1, op(x_2, ... op(x_n, z)...))

    where x1, ..., xn are the elements of this stack.

    Definition Classes
    IterableLikeTraversableOnceGenTraversableOnce
  64. def forall(p: (A) ⇒ Boolean): Boolean

    Tests whether a predicate holds for all elements of this stack.

    Tests whether a predicate holds for all elements of this stack.

    p

    the predicate used to test elements.

    returns

    true if the given predicate p holds for all elements of this stack, otherwise false.

    Definition Classes
    IterableLikeTraversableLikeTraversableOnceGenTraversableOnce
  65. def foreach(f: (A) ⇒ Unit): Unit

    [use case] Applies a function f to all elements of this stack.

    [use case]

    Applies a function f to all elements of this stack.

    Note: this method underlies the implementation of most other bulk operations. Subclasses should re-implement this method if a more efficient implementation exists.

    f

    the function that is applied for its side-effect to every element. The result of function f is discarded.

    Definition Classes
    StackIterableLikeGenericTraversableTemplateTraversableLikeGenTraversableLikeTraversableOnceGenTraversableOnceFilterMonadic
    Full Signature

    def foreach[U](f: (A) ⇒ U): Unit

  66. def formatted(fmtstr: String): String

    Returns string formatted according to given format string.

    Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

    Implicit information
    This member is added by an implicit conversion from Stack[A] to StringFormat performed by method any2stringfmt in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  67. def genericBuilder[B]: Builder[B, Stack[B]]

    The generic builder that builds instances of Stack at arbitrary element types.

    The generic builder that builds instances of Stack at arbitrary element types.

    Definition Classes
    GenericTraversableTemplate
  68. final def getClass(): Class[_]

    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

    a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
    AnyRef → Any
    Note

    not specified by SLS as a member of AnyRef

  69. def groupBy[K](f: (A) ⇒ K): immutable.Map[K, Stack[A]]

    Partitions this stack into a map of stacks according to some discriminator function.

    Partitions this stack into a map of stacks according to some discriminator function.

    Note: this method is not re-implemented by views. This means when applied to a view it will always force the view and return a new stack.

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

    A map from keys to stacks such that the following invariant holds:

    (xs partition f)(k) = xs filter (x => f(x) == k)

    That is, every key k is bound to a stack of those elements x for which f(x) equals k.

    Definition Classes
    TraversableLikeGenTraversableLike
  70. def grouped(size: Int): Iterator[Stack[A]]

    Partitions elements in fixed size stacks.

    Partitions elements in fixed size stacks.

    size

    the number of elements per group

    returns

    An iterator producing stacks of size size, except the last will be truncated if the elements don't divide evenly.

    Definition Classes
    IterableLike
    See also

    scala.collection.Iterator, method grouped

  71. def hasDefiniteSize: Boolean

    Tests whether this stack is known to have a finite size.

    Tests whether this stack is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as Stream, the predicate returns true if all elements have been computed. It returns false if the stream is not yet evaluated to the end.

    Note: many collection methods will not work on collections of infinite sizes.

    returns

    true if this collection is known to have finite size, false otherwise.

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
  72. def hashCode(): Int

    Hashcodes for Stack produce a value from the hashcodes of all the elements of the stack.

    Hashcodes for Stack produce a value from the hashcodes of all the elements of the stack.

    returns

    the hash code value for this object.

    Definition Classes
    GenSeqLikeAny
  73. def head: A

    Selects the first element of this stack.

    Selects the first element of this stack.

    returns

    the first element of this stack.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
    Exceptions thrown
    `NoSuchElementException`

    if the stack is empty.

  74. def headOption: Option[A]

    Optionally selects the first element.

    Optionally selects the first element.

    returns

    the first element of this stack if it is nonempty, None if it is empty.

    Definition Classes
    TraversableLikeGenTraversableLike
  75. def ifParSeq[R](isbody: (ParSeq[A]) ⇒ R): (TraversableOps[A])#Otherwise[R]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  76. def indexOf(elem: A, from: Int): Int

    [use case] Finds index of first occurrence of some value in this stack after or at some start index.

    [use case]

    Finds index of first occurrence of some value in this stack after or at some start index.

    elem

    the element value to search for.

    from

    the start index

    returns

    the index >= from of the first element of this stack that is equal (as determined by ==) to elem, or -1, if none exists.

    Definition Classes
    GenSeqLike
    Full Signature

    def indexOf[B >: A](elem: B, from: Int): Int

  77. def indexOf(elem: A): Int

    [use case] Finds index of first occurrence of some value in this stack.

    [use case]

    Finds index of first occurrence of some value in this stack.

    elem

    the element value to search for.

    returns

    the index of the first element of this stack that is equal (as determined by ==) to elem, or -1, if none exists.

    Definition Classes
    GenSeqLike
    Full Signature

    def indexOf[B >: A](elem: B): Int

  78. def indexOfSlice[B >: A](that: GenSeq[B], from: Int): Int

    Finds first index after or at a start index where this stack contains a given sequence as a slice.

    Finds first index after or at a start index where this stack contains a given sequence as a slice.

    that

    the sequence to test

    from

    the start index

    returns

    the first index >= from such that the elements of this stack starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

    Definition Classes
    SeqLike
  79. def indexOfSlice[B >: A](that: GenSeq[B]): Int

    Finds first index where this stack contains a given sequence as a slice.

    Finds first index where this stack contains a given sequence as a slice.

    that

    the sequence to test

    returns

    the first index such that the elements of this stack starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

    Definition Classes
    SeqLike
  80. def indexWhere(p: (A) ⇒ Boolean, from: Int): Int

    Finds index of the first element satisfying some predicate after or at some start index.

    Finds index of the first element satisfying some predicate after or at some start index.

    p

    the predicate used to test elements.

    from

    the start index

    returns

    the index >= from of the first element of this stack that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    SeqLikeGenSeqLike
  81. def indexWhere(p: (A) ⇒ Boolean): Int

    Finds index of first element satisfying some predicate.

    Finds index of first element satisfying some predicate.

    p

    the predicate used to test elements.

    returns

    the index of the first element of this stack that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    GenSeqLike
  82. def indices: immutable.Range

    Produces the range of all indices of this sequence.

    Produces the range of all indices of this sequence.

    returns

    a Range value from 0 to one less than the length of this stack.

    Definition Classes
    SeqLike
  83. def init: Stack[A]

    Selects all elements except the last.

    Selects all elements except the last.

    returns

    a stack consisting of all elements of this stack except the last one.

    Definition Classes
    TraversableLikeGenTraversableLike
    Exceptions thrown
    `UnsupportedOperationException`

    if the stack is empty.

  84. def inits: Iterator[Stack[A]]

    Iterates over the inits of this stack.

    Iterates over the inits of this stack. The first value will be this stack and the final one will be an empty stack, with the intervening values the results of successive applications of init.

    returns

    an iterator over all the inits of this stack

    Definition Classes
    TraversableLike
    Example:
    1. List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)

  85. def intersect(that: collection.Seq[A]): Stack[A]

    [use case] Computes the multiset intersection between this stack and another sequence.

    [use case]

    Computes the multiset intersection between this stack and another sequence.

    that

    the sequence of elements to intersect with.

    returns

    a new stack which contains all elements of this stack which also appear in that. If an element value x appears n times in that, then the first n occurrences of x will be retained in the result, but any following occurrences will be omitted.

    Definition Classes
    SeqLikeGenSeqLike
    Full Signature

    def intersect[B >: A](that: GenSeq[B]): Stack[A]

  86. def isDefinedAt(idx: Int): Boolean

    Tests whether this stack contains given index.

    Tests whether this stack contains given index.

    The implementations of methods apply and isDefinedAt turn a Seq[A] into a PartialFunction[Int, A].

    idx

    the index to test

    returns

    true if this stack contains an element at position idx, false otherwise.

    Definition Classes
    GenSeqLike
  87. def isEmpty: Boolean

    Checks if the stack is empty.

    Checks if the stack is empty.

    returns

    true, iff there is no element on the stack

    Definition Classes
    StackSeqLikeIterableLikeGenericTraversableTemplateTraversableLikeTraversableOnceGenTraversableOnce
  88. final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object is T0.

    Test whether the dynamic type of the receiver object is T0.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

    true if the receiver object is an instance of erasure of type T0; false otherwise.

    Definition Classes
    Any
  89. def isParIterable: Boolean

    Implicit information
    This member is added by an implicit conversion from Stack[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  90. def isParSeq: Boolean

    Implicit information
    This member is added by an implicit conversion from Stack[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  91. def isParallel: Boolean

    Implicit information
    This member is added by an implicit conversion from Stack[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  92. final def isTraversableAgain: Boolean

    Tests whether this stack can be repeatedly traversed.

    Tests whether this stack can be repeatedly traversed.

    returns

    true

    Definition Classes
    TraversableLikeGenTraversableLikeGenTraversableOnce
  93. def iterator: Iterator[A]

    Returns an iterator over all elements on the stack.

    Returns an iterator over all elements on the stack. This iterator is stable with respect to state changes in the stack object; i.e. such changes will not be reflected in the iterator. The iterator issues elements in the reversed order they were inserted into the stack (LIFO order).

    returns

    an iterator over all stack elements.

    Definition Classes
    StackIterableLikeGenIterableLike
    Annotations
    @migration
    Migration

    (Changed in version 2.8.0) iterator traverses in FIFO order.

  94. def last: A

    Selects the last element.

    Selects the last element.

    returns

    The last element of this stack.

    Definition Classes
    TraversableLikeGenTraversableLike
    Exceptions thrown
    NoSuchElementException

    If the stack is empty.

  95. def lastIndexOf(elem: A, end: Int): Int

    [use case] Finds index of last occurrence of some value in this stack before or at a given end index.

    [use case]

    Finds index of last occurrence of some value in this stack before or at a given end index.

    elem

    the element value to search for.

    end

    the end index.

    returns

    the index <= end of the last element of this stack that is equal (as determined by ==) to elem, or -1, if none exists.

    Definition Classes
    GenSeqLike
    Full Signature

    def lastIndexOf[B >: A](elem: B, end: Int): Int

  96. def lastIndexOf(elem: A): Int

    [use case] Finds index of last occurrence of some value in this stack.

    [use case]

    Finds index of last occurrence of some value in this stack.

    elem

    the element value to search for.

    returns

    the index of the last element of this stack that is equal (as determined by ==) to elem, or -1, if none exists.

    Definition Classes
    GenSeqLike
    Full Signature

    def lastIndexOf[B >: A](elem: B): Int

  97. def lastIndexOfSlice[B >: A](that: GenSeq[B], end: Int): Int

    Finds last index before or at a given end index where this stack contains a given sequence as a slice.

    Finds last index before or at a given end index where this stack contains a given sequence as a slice.

    that

    the sequence to test

    end

    the end index

    returns

    the last index <= end such that the elements of this stack starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

    Definition Classes
    SeqLike
  98. def lastIndexOfSlice[B >: A](that: GenSeq[B]): Int

    Finds last index where this stack contains a given sequence as a slice.

    Finds last index where this stack contains a given sequence as a slice.

    that

    the sequence to test

    returns

    the last index such that the elements of this stack starting a this index match the elements of sequence that, or -1 of no such subsequence exists.

    Definition Classes
    SeqLike
  99. def lastIndexWhere(p: (A) ⇒ Boolean, end: Int): Int

    Finds index of last element satisfying some predicate before or at given end index.

    Finds index of last element satisfying some predicate before or at given end index.

    p

    the predicate used to test elements.

    returns

    the index <= end of the last element of this stack that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    SeqLikeGenSeqLike
  100. def lastIndexWhere(p: (A) ⇒ Boolean): Int

    Finds index of last element satisfying some predicate.

    Finds index of last element satisfying some predicate.

    p

    the predicate used to test elements.

    returns

    the index of the last element of this stack that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    GenSeqLike
  101. def lastOption: Option[A]

    Optionally selects the last element.

    Optionally selects the last element.

    returns

    the last element of this stack$ if it is nonempty, None if it is empty.

    Definition Classes
    TraversableLikeGenTraversableLike
  102. def length: Int

    The number of elements in the stack

    The number of elements in the stack

    returns

    the number of elements in this stack.

    Definition Classes
    StackSeqLikeGenSeqLike
  103. def lengthCompare(len: Int): Int

    Compares the length of this stack to a test value.

    Compares the length of this stack to a test value.

    len

    the test value that gets compared with the length.

    returns

    A value x where

    x <  0       if this.length <  len
    x == 0       if this.length == len
    x >  0       if this.length >  len

    The method as implemented here does not call length directly; its running time is O(length min len) instead of O(length). The method should be overwritten if computing length is cheap.

    Definition Classes
    SeqLike
  104. def lift: (Int) ⇒ Option[A]

    Turns this partial function into an plain function returning an Option result.

    Turns this partial function into an plain function returning an Option result.

    returns

    a function that takes an argument x to Some(this(x)) if this is defined for x, and to None otherwise.

    Definition Classes
    PartialFunction
    See also

    Function.unlift

  105. def map[B](f: (A) ⇒ B): Stack[B]

    [use case] Builds a new collection by applying a function to all elements of this stack.

    [use case]

    Builds a new collection by applying a function to all elements of this stack.

    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

    a new stack resulting from applying the given function f to each element of this stack and collecting the results.

    Definition Classes
    TraversableLikeGenTraversableLikeFilterMonadic
    Full Signature

    def map[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  106. def max: A

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

    the largest element of this stack.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

    def max[B >: A](implicit cmp: Ordering[B]): A

  107. def maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

    Definition Classes
    TraversableOnceGenTraversableOnce
  108. def min: A

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

    the smallest element of this stack

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

    def min[B >: A](implicit cmp: Ordering[B]): A

  109. def minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

    Definition Classes
    TraversableOnceGenTraversableOnce
  110. def mkString: String

    Displays all elements of this stack in a string.

    Displays all elements of this stack in a string.

    returns

    a string representation of this stack. In the resulting string the string representations (w.r.t. the method toString) of all elements of this stack follow each other without any separator string.

    Definition Classes
    TraversableOnceGenTraversableOnce
  111. def mkString(sep: String): String

    Displays all elements of this stack in a string using a separator string.

    Displays all elements of this stack in a string using a separator string.

    sep

    the separator string.

    returns

    a string representation of this stack. In the resulting string the string representations (w.r.t. the method toString) of all elements of this stack are separated by the string sep.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Example:
    1. List(1, 2, 3).mkString("|") = "1|2|3"

  112. def mkString(start: String, sep: String, end: String): String

    Displays all elements of this stack in a string using start, end, and separator strings.

    Displays all elements of this stack in a string using start, end, and separator strings.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    a string representation of this stack. The resulting string begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this stack are separated by the string sep.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Example:
    1. List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"

  113. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

    true if the argument is not a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  114. def newBuilder: Builder[A, Stack[A]]

    The builder that builds instances of type Stack[A]

    The builder that builds instances of type Stack[A]

    Attributes
    protected[this]
    Definition Classes
    GenericTraversableTemplateHasNewBuilder
  115. def nonEmpty: Boolean

    Tests whether the stack is not empty.

    Tests whether the stack is not empty.

    returns

    true if the stack contains at least one element, false otherwise.

    Definition Classes
    TraversableOnceGenTraversableOnce
  116. final def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Note

    not specified by SLS as a member of AnyRef

  117. final def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Note

    not specified by SLS as a member of AnyRef

  118. def orElse[A1 <: Int, B1 >: A](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]

    Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.

    Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.

    A1

    the argument type of the fallback function

    B1

    the result type of the fallback function

    that

    the fallback function

    returns

    a partial function which has as domain the union of the domains of this partial function and that. The resulting partial function takes x to this(x) where this is defined, and to that(x) where it is not.

    Definition Classes
    PartialFunction
  119. def padTo(len: Int, elem: A): Stack[A]

    [use case] A copy of this stack with an element value appended until a given target length is reached.

    [use case]

    A copy of this stack with an element value appended until a given target length is reached.

    len

    the target length

    elem

    the padding value

    returns

    a new stack consisting of all elements of this stack followed by the minimal number of occurrences of elem so that the resulting stack has a length of at least len.

    Definition Classes
    SeqLikeGenSeqLike
    Full Signature

    def padTo[B >: A, That](len: Int, elem: B)(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  120. def par: ParSeq[A]

    Returns a parallel implementation of this collection.

    Returns a parallel implementation of this collection.

    For most collection types, this method creates a new parallel collection by copying all the elements. For these collection, par takes linear time. Mutable collections in this category do not produce a mutable parallel collection that has the same underlying dataset, so changes in one collection will not be reflected in the other one.

    Specific collections (e.g. ParArray or mutable.ParHashMap) override this default behaviour by creating a parallel collection which shares the same underlying dataset. For these collections, par takes constant or sublinear time.

    All parallel collections return a reference to themselves.

    returns

    a parallel implementation of this collection

    Definition Classes
    Parallelizable
  121. def parCombiner: Combiner[A, ParSeq[A]]

    The default par implementation uses the combiner provided by this method to create a new parallel collection.

    The default par implementation uses the combiner provided by this method to create a new parallel collection.

    returns

    a combiner for the parallel collection of type ParRepr

    Attributes
    protected[this]
    Definition Classes
    SeqLikeSeqLikeTraversableLikeParallelizable
  122. def partition(p: (A) ⇒ Boolean): (Stack[A], Stack[A])

    Partitions this stack in two stacks according to a predicate.

    Partitions this stack in two stacks according to a predicate.

    p

    the predicate on which to partition.

    returns

    a pair of stacks: the first stack consists of all elements that satisfy the predicate p and the second stack consists of all elements that don't. The relative order of the elements in the resulting stacks is the same as in the original stack.

    Definition Classes
    TraversableLikeGenTraversableLike
  123. def patch(from: Int, that: GenSeq[A], replaced: Int): Stack[A]

    [use case] Produces a new stack where a slice of elements in this stack is replaced by another sequence.

    [use case]

    Produces a new stack where a slice of elements in this stack is replaced by another sequence.

    from

    the index of the first replaced element

    replaced

    the number of elements to drop in the original stack

    returns

    a new stack consisting of all elements of this stack except that replaced elements starting from from are replaced by patch.

    Definition Classes
    SeqLikeGenSeqLike
    Full Signature

    def patch[B >: A, That](from: Int, patch: GenSeq[B], replaced: Int)(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  124. def permutations: Iterator[Stack[A]]

    Iterates over distinct permutations.

    Iterates over distinct permutations.

    returns

    An Iterator which traverses the distinct permutations of this stack.

    Definition Classes
    SeqLike
    Example:
    1. "abb".permutations = Iterator(abb, bab, bba)

  125. def pop(): A

    Removes the top element from the stack.

    Removes the top element from the stack.

    returns

    the top element

    Exceptions thrown
    Predef.NoSuchElementException
  126. def prefixLength(p: (A) ⇒ Boolean): Int

    Returns the length of the longest prefix whose elements all satisfy some predicate.

    Returns the length of the longest prefix whose elements all satisfy some predicate.

    p

    the predicate used to test elements.

    returns

    the length of the longest prefix of this stack such that every element of the segment satisfies the predicate p.

    Definition Classes
    GenSeqLike
  127. def product: A

    [use case] Multiplies up the elements of this collection.

    [use case]

    Multiplies up the elements of this collection.

    returns

    the product of all elements in this stack of numbers of type Int. Instead of Int, any other type T with an implicit Numeric[T] implementation can be used as element type of the stack and as result type of product. Examples of such types are: Long, Float, Double, BigInt.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

    def product[B >: A](implicit num: Numeric[B]): B

  128. def push(elem1: A, elem2: A, elems: A*): Stack.this.type

    Push two or more elements onto the stack.

    Push two or more elements onto the stack. The last element of the sequence will be on top of the new stack.

    elems

    the element sequence.

    returns

    the stack with the new elements on top.

  129. def push(elem: A): Stack.this.type

    Push an element on the stack.

    Push an element on the stack.

    elem

    the element to push on the stack.

    returns

    the stack with the new element on top.

  130. def pushAll(xs: TraversableOnce[A]): Stack.this.type

    Push all elements in the given traversable object onto the stack.

    Push all elements in the given traversable object onto the stack. The last element in the traversable object will be on top of the new stack.

    xs

    the traversable object.

    returns

    the stack with the new elements on top.

  131. def reduce[A1 >: A](op: (A1, A1) ⇒ A1): A1

    Reduces the elements of this stack using the specified associative binary operator.

    Reduces the elements of this stack using the specified associative binary operator.

    The order in which operations are performed on elements is unspecified and may be nondeterministic.

    A1

    A type parameter for the binary operator, a supertype of A.

    op

    A binary operator that must be associative.

    returns

    The result of applying reduce operator op between all the elements if the stack is nonempty.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Exceptions thrown
    UnsupportedOperationException

    if this stack is empty.

  132. def reduceLeft[B >: A](op: (B, A) ⇒ B): B

    Applies a binary operator to all elements of this stack, going left to right.

    Applies a binary operator to all elements of this stack, going left to right.

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this stack, going left to right:

    op( op( ... op(x_1, x_2) ..., x_{n-1}), x_n)

    where x1, ..., xn are the elements of this stack.

    Definition Classes
    TraversableOnce
    Exceptions thrown
    `UnsupportedOperationException`

    if this stack is empty.

  133. def reduceLeftOption[B >: A](op: (B, A) ⇒ B): Option[B]

    Optionally applies a binary operator to all elements of this stack, going left to right.

    Optionally applies a binary operator to all elements of this stack, going left to right.

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    an option value containing the result of reduceLeft(op) is this stack is nonempty, None otherwise.

    Definition Classes
    TraversableOnceGenTraversableOnce
  134. def reduceOption[A1 >: A](op: (A1, A1) ⇒ A1): Option[A1]

    Reduces the elements of this stack, if any, using the specified associative binary operator.

    Reduces the elements of this stack, if any, using the specified associative binary operator.

    The order in which operations are performed on elements is unspecified and may be nondeterministic.

    A1

    A type parameter for the binary operator, a supertype of A.

    op

    A binary operator that must be associative.

    returns

    An option value containing result of applying reduce operator op between all the elements if the collection is nonempty, and None otherwise.

    Definition Classes
    TraversableOnceGenTraversableOnce
  135. def reduceRight[B >: A](op: (A, B) ⇒ B): B

    Applies a binary operator to all elements of this stack, going right to left.

    Applies a binary operator to all elements of this stack, going right to left.

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this stack, going right to left:

    op(x_1, op(x_2, ..., op(x_{n-1}, x_n)...))

    where x1, ..., xn are the elements of this stack.

    Definition Classes
    IterableLikeTraversableOnceGenTraversableOnce
    Exceptions thrown
    `UnsupportedOperationException`

    if this stack is empty.

  136. def reduceRightOption[B >: A](op: (A, B) ⇒ B): Option[B]

    Optionally applies a binary operator to all elements of this stack, going right to left.

    Optionally applies a binary operator to all elements of this stack, going right to left.

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    an option value containing the result of reduceRight(op) is this stack is nonempty, None otherwise.

    Definition Classes
    TraversableOnceGenTraversableOnce
  137. def repr: Stack[A]

    The collection of type stack underlying this TraversableLike object.

    The collection of type stack underlying this TraversableLike object. By default this is implemented as the TraversableLike object itself, but this can be overridden.

    Definition Classes
    TraversableLikeGenTraversableLike
  138. def reverse: Stack[A]

    Returns new stack wih elements in reversed order.

    Returns new stack wih elements in reversed order.

    returns

    A new stack with all elements of this stack in reversed order.

    Definition Classes
    SeqLikeGenSeqLike
  139. def reverseIterator: Iterator[A]

    An iterator yielding elements in reversed order.

    An iterator yielding elements in reversed order.

    Note: xs.reverseIterator is the same as xs.reverse.iterator but might be more efficient.

    returns

    an iterator yielding the elements of this stack in reversed order

    Definition Classes
    SeqLike
  140. def reverseMap[B](f: (A) ⇒ B): Stack[B]

    [use case] Builds a new collection by applying a function to all elements of this stack and collecting the results in reversed order.

    [use case]

    Builds a new collection by applying a function to all elements of this stack and collecting the results in reversed order.

    Note: xs.reverseMap(f) is the same as xs.reverse.map(f) but might be more efficient.

    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

    a new stack resulting from applying the given function f to each element of this stack and collecting the results in reversed order.

    Definition Classes
    SeqLikeGenSeqLike
    Full Signature

    def reverseMap[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  141. def reversed: List[A]

    Attributes
    protected[this]
    Definition Classes
    TraversableOnce
  142. def runWith[U](action: (A) ⇒ U): (Int) ⇒ Boolean

    Composes this partial function with an action function which gets applied to results of this partial function.

    Composes this partial function with an action function which gets applied to results of this partial function. The action function is invoked only for its side effects; its result is ignored.

    Note that expression pf.runWith(action)(x) is equivalent to

    if(pf isDefinedAt x) { action(pf(x)); true } else false

    except that runWith is implemented via applyOrElse and thus potentially more efficient. Using runWith avoids double evaluation of pattern matchers and guards for partial function literals.

    action

    the action function

    returns

    a function which maps arguments x to isDefinedAt(x). The resulting function runs action(this(x)) where this is defined.

    Definition Classes
    PartialFunction
    Since

    2.10

    See also

    applyOrElse.

  143. def sameElements(that: GenIterable[A]): Boolean

    [use case] Checks if the other iterable collection contains the same elements in the same order as this stack.

    [use case]

    Checks if the other iterable collection contains the same elements in the same order as this stack.

    that

    the collection to compare with.

    returns

    true, if both collections contain the same elements in the same order, false otherwise.

    Definition Classes
    IterableLikeGenIterableLike
    Full Signature

    def sameElements[B >: A](that: GenIterable[B]): Boolean

  144. def scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[Stack[A], B, That]): That

    Computes a prefix scan of the elements of the collection.

    Computes a prefix scan of the elements of the collection.

    Note: The neutral element z may be applied more than once.

    B

    element type of the resulting collection

    That

    type of the resulting collection

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    cbf

    combiner factory which provides a combiner

    returns

    a new stack containing the prefix scan of the elements in this stack

    Definition Classes
    TraversableLikeGenTraversableLike
  145. def scanLeft[B, That](z: B)(op: (B, A) ⇒ B)(implicit bf: CanBuildFrom[Stack[A], B, That]): That

    Produces a collection containing cumulative results of applying the operator going left to right.

    Produces a collection containing cumulative results of applying the operator going left to right.

    B

    the type of the elements in the resulting collection

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

    an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.

    returns

    collection with intermediate results

    Definition Classes
    TraversableLikeGenTraversableLike
  146. def scanRight[B, That](z: B)(op: (A, B) ⇒ B)(implicit bf: CanBuildFrom[Stack[A], B, That]): That

    Produces a collection containing cumulative results of applying the operator going right to left.

    Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.

    Example:

    List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
    B

    the type of the elements in the resulting collection

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

    an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.

    returns

    collection with intermediate results

    Definition Classes
    TraversableLikeGenTraversableLike
    Annotations
    @migration
    Migration

    (Changed in version 2.9.0) The behavior of scanRight has changed. The previous behavior can be reproduced with scanRight.reverse.

  147. def segmentLength(p: (A) ⇒ Boolean, from: Int): Int

    Computes length of longest segment whose elements all satisfy some predicate.

    Computes length of longest segment whose elements all satisfy some predicate.

    p

    the predicate used to test elements.

    from

    the index where the search starts.

    returns

    the length of the longest segment of this stack starting from index from such that every element of the segment satisfies the predicate p.

    Definition Classes
    SeqLikeGenSeqLike
  148. def seq: Seq[A]

    A version of this collection with all of the operations implemented sequentially (i.

    A version of this collection with all of the operations implemented sequentially (i.e. in a single-threaded manner).

    This method returns a reference to this collection. In parallel collections, it is redefined to return a sequential implementation of this collection. In both cases, it has O(1) complexity.

    returns

    a sequential view of the collection.

    Definition Classes
    SeqSeqGenSeqGenSeqLikeIterableIterableGenIterableTraversableTraversableGenTraversableParallelizableTraversableOnceGenTraversableOnce
  149. def size: Int

    The size of this stack, equivalent to length.

    The size of this stack, equivalent to length.

    returns

    the number of elements in this stack.

    Definition Classes
    SeqLikeGenTraversableLikeTraversableOnceGenTraversableOnce
  150. def slice(from: Int, until: Int): Stack[A]

    Selects an interval of elements.

    Selects an interval of elements. The returned collection is made up of all elements x which satisfy the invariant:

    from <= indexOf(x) < until
    returns

    a stack containing the elements greater than or equal to index from extending up to (but not including) index until of this stack.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  151. def sliding(size: Int, step: Int): Iterator[Stack[A]]

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

    size

    the number of elements per group

    step

    the distance between the first elements of successive groups (defaults to 1)

    returns

    An iterator producing stacks of size size, except the last and the only element will be truncated if there are fewer elements than size.

    Definition Classes
    IterableLike
    See also

    scala.collection.Iterator, method sliding

  152. def sliding(size: Int): Iterator[Stack[A]]

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

    size

    the number of elements per group

    returns

    An iterator producing stacks of size size, except the last and the only element will be truncated if there are fewer elements than size.

    Definition Classes
    IterableLike
    See also

    scala.collection.Iterator, method sliding

  153. def sortBy[B](f: (A) ⇒ B)(implicit ord: math.Ordering[B]): Stack[A]

    Sorts this Stack according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.

    Sorts this Stack according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.

    B

    the target type of the transformation f, and the type where the ordering ord is defined.

    f

    the transformation function mapping elements to some other domain B.

    ord

    the ordering assumed on domain B.

    returns

    a stack consisting of the elements of this stack sorted according to the ordering where x < y if ord.lt(f(x), f(y)).

    Definition Classes
    SeqLike
    Example:
    1. val words = "The quick brown fox jumped over the lazy dog".split(' ')
      // this works because scala.Ordering will implicitly provide an Ordering[Tuple2[Int, Char]]
      words.sortBy(x => (x.length, x.head))
      res0: Array[String] = Array(The, dog, fox, the, lazy, over, brown, quick, jumped)
    See also

    scala.math.Ordering

  154. def sortWith(lt: (A, A) ⇒ Boolean): Stack[A]

    Sorts this stack according to a comparison function.

    Sorts this stack according to a comparison function.

    The sort is stable. That is, elements that are equal (as determined by lt) appear in the same order in the sorted sequence as in the original.

    lt

    the comparison function which tests whether its first argument precedes its second argument in the desired ordering.

    returns

    a stack consisting of the elements of this stack sorted according to the comparison function lt.

    Definition Classes
    SeqLike
    Example:
    1. List("Steve", "Tom", "John", "Bob").sortWith(_.compareTo(_) < 0) =
      List("Bob", "John", "Steve", "Tom")
  155. def sorted[B >: A](implicit ord: math.Ordering[B]): Stack[A]

    Sorts this stack according to an Ordering.

    Sorts this stack according to an Ordering.

    The sort is stable. That is, elements that are equal (as determined by lt) appear in the same order in the sorted sequence as in the original.

    ord

    the ordering to be used to compare elements.

    returns

    a stack consisting of the elements of this stack sorted according to the ordering ord.

    Definition Classes
    SeqLike
    See also

    scala.math.Ordering

  156. def span(p: (A) ⇒ Boolean): (Stack[A], Stack[A])

    Splits this stack into a prefix/suffix pair according to a predicate.

    Splits this stack into a prefix/suffix pair according to a predicate.

    Note: c span p is equivalent to (but possibly more efficient than) (c takeWhile p, c dropWhile p), provided the evaluation of the predicate p does not cause any side-effects.

    returns

    a pair consisting of the longest prefix of this stack whose elements all satisfy p, and the rest of this stack.

    Definition Classes
    TraversableLikeGenTraversableLike
  157. def splitAt(n: Int): (Stack[A], Stack[A])

    Splits this stack into two at a given position.

    Splits this stack into two at a given position. Note: c splitAt n is equivalent to (but possibly more efficient than) (c take n, c drop n).

    n

    the position at which to split.

    returns

    a pair of stacks consisting of the first n elements of this stack, and the other elements.

    Definition Classes
    TraversableLikeGenTraversableLike
  158. def startsWith[B](that: GenSeq[B], offset: Int): Boolean

    Tests whether this stack contains the given sequence at a given index.

    Tests whether this stack contains the given sequence at a given index.

    Note: If the both the receiver object this and the argument that are infinite sequences this method may not terminate.

    that

    the sequence to test

    offset

    the index where the sequence is searched.

    returns

    true if the sequence that is contained in this stack at index offset, otherwise false.

    Definition Classes
    SeqLikeGenSeqLike
  159. def startsWith[B](that: GenSeq[B]): Boolean

    Tests whether this stack starts with the given sequence.

    Tests whether this stack starts with the given sequence.

    that

    the sequence to test

    returns

    true if this collection has that as a prefix, false otherwise.

    Definition Classes
    GenSeqLike
  160. def stringPrefix: String

    Defines the prefix of this object's toString representation.

    Defines the prefix of this object's toString representation.

    returns

    a string representation which starts the result of toString applied to this stack. By default the string prefix is the simple name of the collection class stack.

    Definition Classes
    TraversableLikeGenTraversableLike
  161. def sum: A

    [use case] Sums up the elements of this collection.

    [use case]

    Sums up the elements of this collection.

    returns

    the sum of all elements in this stack of numbers of type Int. Instead of Int, any other type T with an implicit Numeric[T] implementation can be used as element type of the stack and as result type of sum. Examples of such types are: Long, Float, Double, BigInt.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

    def sum[B >: A](implicit num: Numeric[B]): B

  162. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  163. def tail: Stack[A]

    Selects all elements except the first.

    Selects all elements except the first.

    returns

    a stack consisting of all elements of this stack except the first one.

    Definition Classes
    TraversableLikeGenTraversableLike
    Exceptions thrown
    `UnsupportedOperationException`

    if the stack is empty.

  164. def tails: Iterator[Stack[A]]

    Iterates over the tails of this stack.

    Iterates over the tails of this stack. The first value will be this stack and the final one will be an empty stack, with the intervening values the results of successive applications of tail.

    returns

    an iterator over all the tails of this stack

    Definition Classes
    TraversableLike
    Example:
    1. List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)

  165. def take(n: Int): Stack[A]

    Selects first n elements.

    Selects first n elements.

    n

    the number of elements to take from this stack.

    returns

    a stack consisting only of the first n elements of this stack, or else the whole stack, if it has less than n elements.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  166. def takeRight(n: Int): Stack[A]

    Selects last n elements.

    Selects last n elements.

    n

    the number of elements to take

    returns

    a stack consisting only of the last n elements of this stack, or else the whole stack, if it has less than n elements.

    Definition Classes
    IterableLike
  167. def takeWhile(p: (A) ⇒ Boolean): Stack[A]

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

    returns

    the longest prefix of this stack whose elements all satisfy the predicate p.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableLike
  168. def thisCollection: collection.Seq[A]

    The underlying collection seen as an instance of Stack.

    The underlying collection seen as an instance of Stack. By default this is implemented as the current collection object itself, but this can be overridden.

    Attributes
    protected[this]
    Definition Classes
    SeqLikeIterableLikeTraversableLike
  169. def to[Col[_]]: Col[A]

    [use case] Converts this stack into another by copying all elements.

    [use case]

    Converts this stack into another by copying all elements.

    Col

    The collection type to build.

    returns

    a new collection containing all elements of this stack.

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
    Full Signature

    def to[Col[_]](implicit cbf: CanBuildFrom[Nothing, A, Col[A]]): Col[A]

  170. def toArray: Array[A]

    [use case] Converts this stack to an array.

    [use case]

    Converts this stack to an array.

    returns

    an array containing all elements of this stack. An ClassTag must be available for the element type of this stack.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

    def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

  171. def toBuffer[B >: A]: Buffer[B]

    Converts this stack to a mutable buffer.

    Converts this stack to a mutable buffer.

    returns

    a buffer containing all elements of this stack.

    Definition Classes
    TraversableOnceGenTraversableOnce
  172. def toCollection(repr: Stack[A]): collection.Seq[A]

    A conversion from collections of type Repr to Stack objects.

    A conversion from collections of type Repr to Stack objects. By default this is implemented as just a cast, but this can be overridden.

    Attributes
    protected[this]
    Definition Classes
    SeqLikeIterableLikeTraversableLike
  173. def toIndexedSeq: immutable.IndexedSeq[A]

    Converts this stack to an indexed sequence.

    Converts this stack to an indexed sequence.

    returns

    an indexed sequence containing all elements of this stack.

    Definition Classes
    TraversableOnceGenTraversableOnce
  174. def toIterable: collection.Iterable[A]

    Converts this stack to an iterable collection.

    Converts this stack to an iterable collection. Note that the choice of target Iterable is lazy in this default implementation as this TraversableOnce may be lazy and unevaluated (i.e. it may be an iterator which is only traversable once).

    returns

    an Iterable containing all elements of this stack.

    Definition Classes
    IterableLikeTraversableOnceGenTraversableOnce
  175. def toIterator: Iterator[A]

    Returns an Iterator over the elements in this stack.

    Returns an Iterator over the elements in this stack. Will return the same Iterator if this instance is already an Iterator.

    returns

    an Iterator containing all elements of this stack.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableOnce
  176. def toList: immutable.List[A]

    Creates a list of all stack elements in LIFO order.

    Creates a list of all stack elements in LIFO order.

    returns

    the created list.

    Definition Classes
    StackTraversableOnceGenTraversableOnce
    Annotations
    @migration
    Migration

    (Changed in version 2.8.0) toList traverses in FIFO order.

  177. def toMap[T, U]: collection.Map[T, U]

    [use case] Converts this stack to a map.

    [use case]

    Converts this stack to a map. This method is unavailable unless the elements are members of Tuple2, each ((T, U)) becoming a key-value pair in the map. Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined.

    returns

    a map of type immutable.Map[T, U] containing all key/value pairs of type (T, U) of this stack.

    Definition Classes
    TraversableOnceGenTraversableOnce
    Full Signature

    def toMap[T, U](implicit ev: <:<[A, (T, U)]): immutable.Map[T, U]

  178. def toParArray: ParArray[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to TraversableOps[A] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  179. def toSeq: collection.Seq[A]

    Converts this stack to a sequence.

    Converts this stack to a sequence.

    Overridden for efficiency.

    returns

    a sequence containing all elements of this stack.

    Definition Classes
    SeqLikeGenSeqLikeTraversableOnceGenTraversableOnce
  180. def toSet[B >: A]: immutable.Set[B]

    Converts this stack to a set.

    Converts this stack to a set.

    returns

    a set containing all elements of this stack.

    Definition Classes
    TraversableOnceGenTraversableOnce
  181. def toStream: immutable.Stream[A]

    Converts this stack to a stream.

    Converts this stack to a stream.

    returns

    a stream containing all elements of this stack.

    Definition Classes
    IterableLikeTraversableLikeGenTraversableOnce
  182. def toString(): String

    Converts this stack to a string.

    Converts this stack to a string.

    returns

    a string representation of this collection. By default this string consists of the stringPrefix of this stack, followed by all elements separated by commas and enclosed in parentheses.

    Definition Classes
    SeqLikeTraversableLikeAny
  183. def toTraversable: collection.Traversable[A]

    Converts this stack to an unspecified Traversable.

    Converts this stack to an unspecified Traversable. Will return the same collection if this instance is already Traversable.

    returns

    a Traversable containing all elements of this stack.

    Definition Classes
    TraversableLikeTraversableOnceGenTraversableOnce
  184. def toVector: Vector[A]

    Converts this stack to a Vector.

    Converts this stack to a Vector.

    returns

    a vector containing all elements of this stack.

    Definition Classes
    TraversableOnceGenTraversableOnce
  185. def top: A

    Returns the top element of the stack.

    Returns the top element of the stack. This method will not remove the element from the stack. An error is signaled if there is no element on the stack.

    returns

    the top element

    Exceptions thrown
    Predef.NoSuchElementException
  186. def transform(f: (A) ⇒ A): Stack.this.type

    Applies a transformation function to all values contained in this sequence.

    Applies a transformation function to all values contained in this sequence. The transformation function produces new values from existing elements.

    f

    the transformation to apply

    returns

    the sequence itself.

    Definition Classes
    SeqLike
  187. def transpose[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Stack[Stack[B]]

    Transposes this stack of traversable collections into a stack of stacks.

    Transposes this stack of traversable collections into a stack of stacks.

    B

    the type of the elements of each traversable collection.

    asTraversable

    an implicit conversion which asserts that the element type of this stack is a Traversable.

    returns

    a two-dimensional stack of stacks which has as nth row the nth column of this stack.

    Definition Classes
    GenericTraversableTemplate
    Annotations
    @migration
    Migration

    (Changed in version 2.9.0) transpose throws an IllegalArgumentException if collections are not uniformly sized.

    Exceptions thrown
    `IllegalArgumentException`

    if all collections in this stack are not of the same size.

  188. def union(that: collection.Seq[A]): Stack[A]

    [use case] Produces a new sequence which contains all elements of this stack and also all elements of a given sequence.

    [use case]

    Produces a new sequence which contains all elements of this stack and also all elements of a given sequence. xs union ys is equivalent to xs ++ ys.

    Another way to express this is that xs union ys computes the order-presevring multi-set union of xs and ys. union is hence a counter-part of diff and intersect which also work on multi-sets.

    that

    the sequence to add.

    returns

    a new stack which contains all elements of this stack followed by all elements of that.

    Definition Classes
    SeqLikeGenSeqLike
    Full Signature

    def union[B >: A, That](that: GenSeq[B])(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  189. def unzip[A1, A2](implicit asPair: (A) ⇒ (A1, A2)): (Stack[A1], Stack[A2])

    Converts this stack of pairs into two collections of the first and second half of each pair.

    Converts this stack of pairs into two collections of the first and second half of each pair.

    A1

    the type of the first half of the element pairs

    A2

    the type of the second half of the element pairs

    asPair

    an implicit conversion which asserts that the element type of this stack is a pair.

    returns

    a pair stacks, containing the first, respectively second half of each element pair of this stack.

    Definition Classes
    GenericTraversableTemplate
  190. def unzip3[A1, A2, A3](implicit asTriple: (A) ⇒ (A1, A2, A3)): (Stack[A1], Stack[A2], Stack[A3])

    Converts this stack of triples into three collections of the first, second, and third element of each triple.

    Converts this stack of triples into three collections of the first, second, and third element of each triple.

    A1

    the type of the first member of the element triples

    A2

    the type of the second member of the element triples

    A3

    the type of the third member of the element triples

    asTriple

    an implicit conversion which asserts that the element type of this stack is a triple.

    returns

    a triple stacks, containing the first, second, respectively third member of each element triple of this stack.

    Definition Classes
    GenericTraversableTemplate
  191. def update(n: Int, newelem: A): Unit

    Replace element at index n with the new element newelem.

    Replace element at index n with the new element newelem.

    This is a linear time operation.

    n

    the index of the element to replace.

    newelem

    the new element.

    Definition Classes
    StackSeqLike
    Exceptions thrown
    IndexOutOfBoundsException

    if the index is not valid

  192. def updated(index: Int, elem: A): Stack[A]

    [use case] A copy of this stack with one single replaced element.

    [use case]

    A copy of this stack with one single replaced element.

    index

    the position of the replacement

    elem

    the replacing element

    returns

    a copy of this stack with the element at position index replaced by elem.

    Definition Classes
    SeqLikeGenSeqLike
    Full Signature

    def updated[B >: A, That](index: Int, elem: B)(implicit bf: CanBuildFrom[Stack[A], B, That]): That

  193. def view(from: Int, until: Int): SeqView[A, Stack[A]]

    Creates a non-strict view of a slice of this stack.

    Creates a non-strict view of a slice of this stack.

    Note: the difference between view and slice is that view produces a view of the current stack, whereas slice produces a new stack.

    Note: view(from, to) is equivalent to view.slice(from, to)

    from

    the index of the first element of the view

    until

    the index of the element following the view

    returns

    a non-strict view of a slice of this stack, starting at index from and extending up to (but not including) index until.

    Definition Classes
    SeqLikeIterableLikeTraversableLike
  194. def view: SeqView[A, Stack[A]]

    Creates a non-strict view of this stack.

    Creates a non-strict view of this stack.

    returns

    a non-strict view of this stack.

    Definition Classes
    SeqLikeIterableLikeTraversableLike
  195. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()
  196. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()
  197. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()
  198. def withFilter(p: (A) ⇒ Boolean): FilterMonadic[A, Stack[A]]

    Creates a non-strict filter of this stack.

    Creates a non-strict filter of this stack.

    Note: the difference between c filter p and c withFilter p is that the former creates a new collection, whereas the latter only restricts the domain of subsequent map, flatMap, foreach, and withFilter operations.

    p

    the predicate used to test elements.

    returns

    an object of class WithFilter, which supports map, flatMap, foreach, and withFilter operations. All these operations apply to those elements of this stack which satisfy the predicate p.

    Definition Classes
    TraversableLikeFilterMonadic
  199. def zip[B](that: GenIterable[B]): Stack[(A, B)]

    [use case] Returns a stack formed from this stack and another iterable collection by combining corresponding elements in pairs.

    [use case]

    Returns a stack formed from this stack and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    returns

    a new stack containing pairs consisting of corresponding elements of this stack and that. The length of the returned collection is the minimum of the lengths of this stack and that.

    Definition Classes
    IterableLikeGenIterableLike
    Full Signature

    def zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[Stack[A], (A1, B), That]): That

  200. def zipAll[B](that: collection.Iterable[B], thisElem: A, thatElem: B): Stack[(A, B)]

    [use case] Returns a stack formed from this stack and another iterable collection by combining corresponding elements in pairs.

    [use case]

    Returns a stack formed from this stack and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    thisElem

    the element to be used to fill up the result if this stack is shorter than that.

    thatElem

    the element to be used to fill up the result if that is shorter than this stack.

    returns

    a new stack containing pairs consisting of corresponding elements of this stack and that. The length of the returned collection is the maximum of the lengths of this stack and that. If this stack is shorter than that, thisElem values are used to pad the result. If that is shorter than this stack, thatElem values are used to pad the result.

    Definition Classes
    IterableLikeGenIterableLike
    Full Signature

    def zipAll[B, A1 >: A, That](that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[Stack[A], (A1, B), That]): That

  201. def zipWithIndex: Stack[(A, Int)]

    [use case] Zips this stack with its indices.

    [use case]

    Zips this stack with its indices.

    returns

    A new stack containing pairs consisting of all elements of this stack paired with their index. Indices start at 0.

    Definition Classes
    IterableLikeGenIterableLike
    Full Signature

    def zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[Stack[A], (A1, Int), That]): That

    Example:
    1. List("a", "b", "c").zipWithIndex = List(("a", 0), ("b", 1), ("c", 2))

  202. def [B](y: B): (Stack[A], B)

    Implicit information
    This member is added by an implicit conversion from Stack[A] to ArrowAssoc[Stack[A]] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Shadowed Implict Value Members

  1. def filter(p: (A) ⇒ Boolean): TraversableOnce[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (stack: MonadOps[A]).filter(p)
    Definition Classes
    MonadOps
  2. def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): TraversableOnce[B]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (stack: MonadOps[A]).flatMap(f)
    Definition Classes
    MonadOps
  3. def map[B](f: (A) ⇒ B): TraversableOnce[B]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (stack: MonadOps[A]).map(f)
    Definition Classes
    MonadOps
  4. val self: Any

    Implicit information
    This member is added by an implicit conversion from Stack[A] to StringAdd performed by method any2stringadd in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (stack: StringAdd).self
    Definition Classes
    StringAdd
  5. val self: Any

    Implicit information
    This member is added by an implicit conversion from Stack[A] to StringFormat performed by method any2stringfmt in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (stack: StringFormat).self
    Definition Classes
    StringFormat
  6. def withFilter(p: (A) ⇒ Boolean): Iterator[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (stack: MonadOps[A]).withFilter(p)
    Definition Classes
    MonadOps

Deprecated Value Members

  1. def /:\[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1

    A syntactic sugar for out of order folding.

    A syntactic sugar for out of order folding. See fold.

    Example:

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = (a /:\ 5)(_+_)
    b: Int = 15
    Definition Classes
    GenTraversableOnce
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) use fold instead

  2. def x: Stack[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to ArrowAssoc[Stack[A]] performed by method any2ArrowAssoc in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (stack: ArrowAssoc[Stack[A]]).x
    Definition Classes
    ArrowAssoc
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) Use leftOfArrow instead

  3. def x: Stack[A]

    Implicit information
    This member is added by an implicit conversion from Stack[A] to Ensuring[Stack[A]] performed by method any2Ensuring in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (stack: Ensuring[Stack[A]]).x
    Definition Classes
    Ensuring
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) Use resultOfEnsuring instead

Inherited from Serializable

Inherited from java.io.Serializable

Inherited from AbstractSeq[A]

Inherited from Seq[A]

Inherited from SeqLike[A, Stack[A]]

Inherited from Cloneable[Stack[A]]

Inherited from scala.Cloneable

Inherited from java.lang.Cloneable

Inherited from Iterable[A]

Inherited from Traversable[A]

Inherited from Mutable

Inherited from collection.AbstractSeq[A]

Inherited from collection.Seq[A]

Inherited from collection.SeqLike[A, Stack[A]]

Inherited from GenSeq[A]

Inherited from GenSeqLike[A, Stack[A]]

Inherited from PartialFunction[Int, A]

Inherited from (Int) ⇒ A

Inherited from collection.AbstractIterable[A]

Inherited from collection.Iterable[A]

Inherited from IterableLike[A, Stack[A]]

Inherited from Equals

Inherited from GenIterable[A]

Inherited from GenIterableLike[A, Stack[A]]

Inherited from AbstractTraversable[A]

Inherited from collection.Traversable[A]

Inherited from GenTraversable[A]

Inherited from GenericTraversableTemplate[A, Stack]

Inherited from TraversableLike[A, Stack[A]]

Inherited from GenTraversableLike[A, Stack[A]]

Inherited from Parallelizable[A, ParSeq[A]]

Inherited from TraversableOnce[A]

Inherited from GenTraversableOnce[A]

Inherited from FilterMonadic[A, Stack[A]]

Inherited from HasNewBuilder[A, Stack[A]]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion traversable2ops from Stack[A] to TraversableOps[A]

Inherited by implicit conversion MonadOps from Stack[A] to MonadOps[A]

Inherited by implicit conversion any2stringadd from Stack[A] to StringAdd

Inherited by implicit conversion any2stringfmt from Stack[A] to StringFormat

Inherited by implicit conversion any2ArrowAssoc from Stack[A] to ArrowAssoc[Stack[A]]

Inherited by implicit conversion any2Ensuring from Stack[A] to Ensuring[Stack[A]]

Inherited by implicit conversion alternateImplicit from Stack[A] to ForceImplicitAmbiguity

Ungrouped