Packages

class Prepended[+A] extends AbstractView[A]

A view that prepends an element to its elements

Annotations
@SerialVersionUID()
Source
View.scala
Linear Supertypes
AbstractView[A], View[A], AbstractIterable[A], Iterable[A], Serializable, java.io.Serializable, IterableOps[A, [_]View[_], View[A]], IterableOnceOps[A, [_]View[_], View[A]], IterableOnce[A], AnyRef, Any
Known Subclasses
Type Hierarchy
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Inherited
  1. Prepended
  2. AbstractView
  3. View
  4. AbstractIterable
  5. Iterable
  6. Serializable
  7. Serializable
  8. IterableOps
  9. IterableOnceOps
  10. IterableOnce
  11. AnyRef
  12. Any
Implicitly
  1. by iterableOnceExtensionMethods
  2. by any2stringadd
  3. by StringFormat
  4. by Ensuring
  5. by ArrowAssoc
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new Prepended(elem: A, underlying: SomeIterableOps[A])

Type Members

  1. type IterableCC[X] = View[X]

    Type alias to CC.

    Type alias to CC. It is used to provide a default implementation of the fromSpecific and newSpecificBuilder operations.

    Due to the @uncheckedVariance annotation, usage of this type member can be unsound and is therefore not recommended.

    Attributes
    protected
    Definition Classes
    IterableOps

Value Members

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

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

    Definition Classes
    AnyRef → Any
  2. 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
  3. def +(other: String): String
    Implicit
    This member is added by an implicit conversion from Prepended[A] toany2stringadd[Prepended[A]] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. final def ++[B >: A](suffix: IterableOnce[B]): View[B]

    Alias for concat

    Alias for concat

    Definition Classes
    IterableOps
    Annotations
    @inline()
  5. def ->[B](y: B): (Prepended[A], B)
    Implicit
    This member is added by an implicit conversion from Prepended[A] toArrowAssoc[Prepended[A]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  6. final def ==(arg0: Any): Boolean

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    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
    AnyRef → Any
  7. final def addString(b: mutable.StringBuilder): mutable.StringBuilder

    Appends all elements of this $coll to a string builder.

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

    Example:

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

    the string builder to which elements are appended.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  8. final def addString(b: mutable.StringBuilder, sep: String): mutable.StringBuilder

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

    Appends all elements of this $coll 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 $coll, separated by the string sep.

    Example:

    scala> val a = List(1,2,3,4)
    a: List[Int] = List(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
    IterableOnceOps
    Annotations
    @inline()
  9. def addString(b: mutable.StringBuilder, start: String, sep: String, end: String): mutable.StringBuilder

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

    Appends all elements of this $coll 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 $coll are separated by the string sep.

    Example:

    scala> val a = List(1,2,3,4)
    a: List[Int] = List(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> a.addString(b , "List(" , ", " , ")")
    res5: StringBuilder = List(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
    IterableOnceOps
  10. 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.

  11. def className: String

    Defines the prefix of this object's toString representation.

    Defines the prefix of this object's toString representation.

    It is recommended to return the name of the concrete collection type, but not implementation subclasses. For example, for ListMap this method should return "ListMap", not "Map" (the supertype) or "Node" (an implementation subclass).

    The default implementation returns "Iterable". It is overridden for the basic collection kinds "Seq", "IndexedSeq", "LinearSeq", "Buffer", "Set", "Map", "SortedSet", "SortedMap" and "View".

    returns

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

    Attributes
    protected[this]
    Definition Classes
    Iterable
  12. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

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

    not specified by SLS as a member of AnyRef

  13. def coll: Prepended.this.type

    returns

    This collection as a C.

    Attributes
    protected
    Definition Classes
    IterableIterableOps
  14. def collect[B](pf: PartialFunction[A, B]): View[B]

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

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

    B

    the element type of the returned iterable collection.

    pf

    the partial function which filters and maps the iterable collection.

    returns

    a new iterable collection 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
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesAndProducesIterator

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

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

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

    $mayNotTerminateInf $orderDependent

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

  16. def concat[B >: A](suffix: IterableOnce[B]): View[B]

    Returns a new iterable collection containing the elements from the left hand operand followed by the elements from the right hand operand.

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

    B

    the element type of the returned collection.

    suffix

    the traversable to append.

    returns

    a new iterable collection which contains all elements of this iterable collection followed by all elements of suffix.

    Definition Classes
    IterableOps
  17. def copyToArray(xs: Array[A], start: Int, len: Int): Int

    [use case] Note: will not terminate for infinite-sized collections.

    [use case]

    Note: will not terminate for infinite-sized collections.

    xs

    the array to fill.

    start

    the starting index of xs.

    len

    the maximal number of elements to copy.

    returns

    the number of elements written to the array

    Definition Classes
    IterableOnceOps
    Full Signature

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

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

    [use case] Note: will not terminate for infinite-sized collections.

    [use case]

    Note: will not terminate for infinite-sized collections.

    xs

    the array to fill.

    start

    the starting index of xs.

    returns

    the number of elements written to the array

    Definition Classes
    IterableOnceOps
    Full Signature

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

  19. def copyToArray(xs: Array[A]): Int

    [use case] Note: will not terminate for infinite-sized collections.

    [use case]

    Note: will not terminate for infinite-sized collections.

    xs

    the array to fill.

    returns

    the number of elements written to the array

    Definition Classes
    IterableOnceOps
    Full Signature

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

  20. def corresponds[B](that: IterableOnce[B])(p: (A, B) ⇒ Boolean): Boolean

    Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

    Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

    B

    the type of the elements of that

    that

    the other collection

    p

    the test predicate, which relates elements from both collections

    returns

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

    Definition Classes
    IterableOnceOps
  21. def count(p: (A) ⇒ Boolean): Int

    Counts the number of elements in the $coll which satisfy a predicate.

    Counts the number of elements in the $coll which satisfy a predicate.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    IterableOnceOps
  22. def drop(n: Int): View[A]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

    the number of elements to drop from this iterable collection.

    returns

    a iterable collection consisting of all elements of this iterable collection except the first n ones, or else the empty iterable collection, if this iterable collection has less than n elements. If n is negative, don't drop any elements.

    Definition Classes
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesAndProducesIterator

  23. def dropRight(n: Int): View[A]

    The rest of the collection without its n last elements.

    The rest of the collection without its n last elements. For linear, immutable collections this should avoid making a copy.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Definition Classes
    IterableOps
  24. def dropWhile(p: (A) ⇒ Boolean): View[A]

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesAndProducesIterator

  25. def ensuring(cond: (Prepended[A]) ⇒ Boolean, msg: ⇒ Any): Prepended[A]
    Implicit
    This member is added by an implicit conversion from Prepended[A] toEnsuring[Prepended[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  26. def ensuring(cond: (Prepended[A]) ⇒ Boolean): Prepended[A]
    Implicit
    This member is added by an implicit conversion from Prepended[A] toEnsuring[Prepended[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  27. def ensuring(cond: Boolean, msg: ⇒ Any): Prepended[A]
    Implicit
    This member is added by an implicit conversion from Prepended[A] toEnsuring[Prepended[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  28. def ensuring(cond: Boolean): Prepended[A]
    Implicit
    This member is added by an implicit conversion from Prepended[A] toEnsuring[Prepended[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  29. final def eq(arg0: AnyRef): Boolean

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

    Tests whether the argument (that) 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
  30. def equals(arg0: Any): Boolean

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to eq.

    See also equals in scala.Any.

    returns

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

    Definition Classes
    AnyRef → Any
  31. def exists(p: (A) ⇒ Boolean): Boolean

    Tests whether a predicate holds for at least one element of this $coll.

    Tests whether a predicate holds for at least one element of this $coll.

    $mayNotTerminateInf

    p

    the predicate used to test elements.

    returns

    true if the given predicate p is satisfied by at least one element of this $coll, otherwise false

    Definition Classes
    IterableOnceOps
  32. def filter(pred: (A) ⇒ Boolean): View[A]

    Selects all elements of this iterable collection which satisfy a predicate.

    Selects all elements of this iterable collection which satisfy a predicate.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  33. def filterNot(pred: (A) ⇒ Boolean): View[A]

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

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

    pred

    the predicate used to test elements.

    returns

    a new iterable collection consisting of all elements of this iterable collection that do not satisfy the given predicate pred. Their order may not be preserved.

    Definition Classes
    IterableOpsIterableOnceOps
  34. 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(classOf[java.lang.Throwable])
    Note

    not specified by SLS as a member of AnyRef

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

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

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

    $mayNotTerminateInf $orderDependent

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOnceOps
  36. def flatMap[B](f: (A) ⇒ IterableOnce[B]): View[B]

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

    Builds a new iterable collection by applying a function to all elements of this iterable collection 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 iterable collection. 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: String) => word.toSeq)
    
    // xs will be 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 iterable collection resulting from applying the given collection-valued function f to each element of this iterable collection and concatenating the results.

    Definition Classes
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesAndProducesIterator

  37. def flatten[B](implicit asIterable: (A) ⇒ IterableOnce[B]): View[B]

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

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

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

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

    the type of the elements of each traversable collection.

    asIterable

    an implicit conversion which asserts that the element type of this iterable collection is a GenTraversable.

    returns

    a new iterable collection resulting from concatenating all element iterable collections.

    Definition Classes
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesAndProducesIterator

  38. def foldLeft[B](z: B)(op: (B, A) ⇒ B): B

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

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

    $willNotTerminateInf $orderDependentFold

    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 $coll, 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 $coll. Returns z if this $coll is empty.

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

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

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

    $willNotTerminateInf $orderDependentFold

    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 $coll, 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 $coll. Returns z if this $coll is empty.

    Definition Classes
    IterableOnceOps
  40. def forall(p: (A) ⇒ Boolean): Boolean

    Tests whether a predicate holds for all elements of this $coll.

    Tests whether a predicate holds for all elements of this $coll.

    $mayNotTerminateInf

    p

    the predicate used to test elements.

    returns

    true if this $coll is empty or the given predicate p holds for all elements of this $coll, otherwise false.

    Definition Classes
    IterableOnceOps
  41. def foreach[U](f: (A) ⇒ U): Unit

    Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.

    Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.

    Definition Classes
    IterableOnceOps
  42. 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
    This member is added by an implicit conversion from Prepended[A] toStringFormat[Prepended[A]] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  43. def fromSpecific(coll: IterableOnce[A]): IterableCC[A]

    Defines how to turn a given Iterable[A] into a collection of type C.

    Defines how to turn a given Iterable[A] into a collection of type C.

    This process can be done in a strict way or a non-strict way (ie. without evaluating the elements of the resulting collections). In other words, this methods defines the evaluation model of the collection.

    Attributes
    protected
    Definition Classes
    IterableIterableOps
    Note

    As witnessed by the @uncheckedVariance annotation, using this method might be unsound. However, as long as it is called with an Iterable[A] obtained from this collection (as it is the case in the implementations of operations where we use a View[A]), it is safe.

  44. final def getClass(): Class[_]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

    a class object corresponding to the runtime type of the receiver.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  45. def groupBy[K](f: (A) ⇒ K): immutable.Map[K, View[A]]

    Partitions this iterable collection into a map of iterable collections according to some discriminator function.

    Partitions this iterable collection into a map of iterable collections according to some discriminator function.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

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

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

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

    Definition Classes
    IterableOps
  46. def groupMap[K, B](key: (A) ⇒ K)(f: (A) ⇒ B): immutable.Map[K, View[B]]

    Partitions this iterable collection into a map of iterable collections according to a discriminator function key.

    Partitions this iterable collection into a map of iterable collections according to a discriminator function key. Each element in a group is transformed into a value of type B using the value function.

    It is equivalent to groupBy(key).mapValues(_.map(f)), but more efficient.

    case class User(name: String, age: Int)
    
    def namesByAge(users: Seq[User]): Map[Int, Seq[String]] =
      users.groupMap(_.age)(_.name)

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    K

    the type of keys returned by the discriminator function

    B

    the type of values returned by the transformation function

    key

    the discriminator function

    f

    the element transformation function

    Definition Classes
    IterableOps
  47. def groupMapReduce[K, B](key: (A) ⇒ K)(f: (A) ⇒ B)(reduce: (B, B) ⇒ B): immutable.Map[K, B]

    Partitions this iterable collection into a map according to a discriminator function key.

    Partitions this iterable collection into a map according to a discriminator function key. All the values that have the same discriminator are then transformed by the value function and then reduced into a single value with the reduce function.

    It is equivalent to groupBy(key).mapValues(_.map(f).reduce(reduce)), but more efficient.

    def occurrences[A](as: Seq[A]): Map[A, Int] =
      as.groupMapReduce(identity)(_ => 1)(_ + _)
    Definition Classes
    IterableOps
  48. def grouped(size: Int): Iterator[View[A]]

    Partitions elements in fixed size iterable collections.

    Partitions elements in fixed size iterable collections.

    size

    the number of elements per group

    returns

    An iterator producing iterable collections of size size, except the last will be less than size size if the elements don't divide evenly.

    Definition Classes
    IterableOps
    See also

    scala.collection.Iterator, method grouped

  49. def hashCode(): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  50. def head: A

    Selects the first element of this iterable collection.

    Selects the first element of this iterable collection.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

    the first element of this iterable collection.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException if the iterable collection is empty.

  51. def headOption: Option[A]

    Optionally selects the first element.

    Optionally selects the first element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

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

    Definition Classes
    IterableOps
  52. def init: View[A]

    The initial part of the collection without its last element.

    The initial part of the collection without its last element.

    Definition Classes
    IterableOps
  53. def inits: Iterator[View[A]]

    Iterates over the inits of this iterable collection.

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

    returns

    an iterator over all the inits of this iterable collection

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

  54. def isEmpty: Boolean

    Tests whether the view is empty.

    Tests whether the view is empty.

    Note: Implementations in subclasses that are not repeatedly traversable must take care not to consume any elements when isEmpty is called.

    returns

    true if the view contains no elements, false otherwise.

    Definition Classes
    PrependedIterableOnceOps
  55. 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
  56. def isTraversableAgain: Boolean

    Tests whether this iterable collection can be repeatedly traversed.

    Tests whether this iterable collection can be repeatedly traversed. Always true for Iterables and false for Iterators unless overridden.

    returns

    true if it is repeatedly traversable, false otherwise.

    Definition Classes
    IterableOpsIterableOnceOps
  57. def iterableFactory: IterableFactory[View]

    returns

    The factory of this collection.

    Definition Classes
    ViewIterableIterableOps
    Note

    This operation has to be overridden by concrete collection classes to effectively return an IterableFactory[IterableCC]. The implementation in Iterable only returns an IterableFactory[Iterable], but the compiler will not throw an error if the effective IterableCC type constructor is more specific than Iterable.

  58. def iterator: Iterator[A]

    Iterator can be used only once

    Iterator can be used only once

    Definition Classes
    PrependedIterableOnce
  59. def knownSize: Int

    returns

    The number of elements in this view, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.

    Definition Classes
    PrependedIterableOnceOpsIterableOnce
  60. def last: A

    Selects the last element.

    Selects the last element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

    The last element of this iterable collection.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException If the iterable collection is empty.

  61. def lastOption: Option[A]

    Optionally selects the last element.

    Optionally selects the last element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

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

    Definition Classes
    IterableOps
  62. def lazyZip[B](that: Iterable[B]): LazyZip2[A, B, Prepended.this.type]

    Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

    Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

    Calls to lazyZip can be chained to support higher arities (up to 4) without incurring the expense of constructing and deconstructing intermediary tuples.

    val xs = List(1, 2, 3)
    val res = (xs lazyZip xs lazyZip xs lazyZip xs).map((a, b, c, d) => a + b + c + d)
    // res == List(4, 8, 12)
    B

    the type of the second element in each eventual pair

    that

    the iterable providing the second element of each eventual pair

    returns

    a decorator LazyZip2 that allows strict operations to be performed on the lazily evaluated pairs or chained calls to lazyZip. Implicit conversion to Iterable[(A, B)] is also supported.

    Definition Classes
    Iterable
  63. def map[B](f: (A) ⇒ B): View[B]

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

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

    B

    the element type of the returned iterable collection.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesAndProducesIterator

  64. def max: A

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

    the largest element of this view.

    Definition Classes
    IterableOnceOps
    Full Signature

    def max[B >: A](implicit ord: math.Ordering[B]): A

    Exceptions thrown

    UnsupportedOperationException if this view is empty.

  65. def maxBy[B](f: (A) ⇒ B): A

    [use case] Finds the first element which yields the largest value measured by function f.

    [use case]

    Finds the first element which yields the largest value measured by function f.

    B

    The result type of the function f.

    f

    The measuring function.

    returns

    the first element of this view with the largest value measured by function f.

    Definition Classes
    IterableOnceOps
    Full Signature

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

    Exceptions thrown

    UnsupportedOperationException if this view is empty.

  66. def maxByOption[B](f: (A) ⇒ B): Option[A]

    [use case] Finds the first element which yields the largest value measured by function f.

    [use case]

    Finds the first element which yields the largest value measured by function f.

    B

    The result type of the function f.

    f

    The measuring function.

    returns

    an option value containing the first element of this view with the largest value measured by function f.

    Definition Classes
    IterableOnceOps
    Full Signature

    def maxByOption[B](f: (A) ⇒ B)(implicit cmp: math.Ordering[B]): Option[A]

  67. def maxOption: Option[A]

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

    an option value containing the largest element of this view.

    Definition Classes
    IterableOnceOps
    Full Signature

    def maxOption[B >: A](implicit ord: math.Ordering[B]): Option[A]

  68. def min: A

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

    the smallest element of this view

    Definition Classes
    IterableOnceOps
    Full Signature

    def min[B >: A](implicit ord: math.Ordering[B]): A

    Exceptions thrown

    UnsupportedOperationException if this view is empty.

  69. def minBy[B](f: (A) ⇒ B): A

    [use case] Finds the first element which yields the smallest value measured by function f.

    [use case]

    Finds the first element which yields the smallest value measured by function f.

    B

    The result type of the function f.

    f

    The measuring function.

    returns

    the first element of this view with the smallest value measured by function f.

    Definition Classes
    IterableOnceOps
    Full Signature

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

    Exceptions thrown

    UnsupportedOperationException if this view is empty.

  70. def minByOption[B](f: (A) ⇒ B): Option[A]

    [use case] Finds the first element which yields the smallest value measured by function f.

    [use case]

    Finds the first element which yields the smallest value measured by function f.

    B

    The result type of the function f.

    f

    The measuring function.

    returns

    an option value containing the first element of this view with the smallest value measured by function f.

    Definition Classes
    IterableOnceOps
    Full Signature

    def minByOption[B](f: (A) ⇒ B)(implicit cmp: math.Ordering[B]): Option[A]

  71. def minOption: Option[A]

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

    an option value containing the smallest element of this view.

    Definition Classes
    IterableOnceOps
    Full Signature

    def minOption[B >: A](implicit ord: math.Ordering[B]): Option[A]

  72. final def mkString: String

    Displays all elements of this $coll in a string.

    Displays all elements of this $coll in a string.

    Delegates to addString, which can be overridden.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  73. final def mkString(sep: String): String

    Displays all elements of this $coll in a string using a separator string.

    Displays all elements of this $coll in a string using a separator string.

    Delegates to addString, which can be overridden.

    sep

    the separator string.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
    Example:
    1. List(1, 2, 3).mkString("|") = "1|2|3"

  74. final def mkString(start: String, sep: String, end: String): String

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

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

    Delegates to addString, which can be overridden.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    a string representation of this $coll. 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 $coll are separated by the string sep.

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

  75. 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
  76. def newSpecificBuilder: Builder[A, IterableCC[A]]

    returns

    a strict builder for the same collection type. Note that in the case of lazy collections (e.g. View or immutable.LazyList), it is possible to implement this method but the resulting Builder will break laziness. As a consequence, operations should preferably be implemented with fromSpecific instead of this method.

    Attributes
    protected
    Definition Classes
    IterableIterableOps
    Note

    As witnessed by the @uncheckedVariance annotation, using this method might be unsound. However, as long as the returned builder is only fed with A values taken from this instance, it is safe.

  77. def nonEmpty: Boolean

    Tests whether the $coll is not empty.

    Tests whether the $coll is not empty.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding("nonEmpty is defined as !isEmpty; override isEmpty instead", "2.13.0")
  78. 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
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  79. 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
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  80. def partition(p: (A) ⇒ Boolean): (View[A], View[A])

    A pair of, first, all elements that satisfy predicate p and, second, all elements that do not.

    A pair of, first, all elements that satisfy predicate p and, second, all elements that do not. Interesting because it splits a collection in two.

    The default implementation provided here needs to traverse the collection twice. Strict collections have an overridden version of partition in StrictOptimizedIterableOps, which requires only a single traversal.

    Definition Classes
    IterableOps
  81. def partitionWith[A1, A2](f: (A) ⇒ Either[A1, A2]): (View[A1], View[A2])

    A pair of iterable collections, first, consisting of the values that are produced by f applied to this iterable collection elements contained in scala.util.Left and, second, all the values contained in scala.util.Right.

    A pair of iterable collections, first, consisting of the values that are produced by f applied to this iterable collection elements contained in scala.util.Left and, second, all the values contained in scala.util.Right.

    Example:

    val xs = Iterable(1, "one", 2, "two", 3, "three") partitionWith {
     case i: Int => Left(i)
     case s: String => Right(s)
    }
    // xs == (Iterable(1, 2, 3),
    //        Iterable(one, two, three))
    A1

    element type of the first resulting collection

    A2

    element type of the second resulting collection

    f

    split function that map the element of the iterable collection into an scala.util.Either[A1, A2]

    returns

    a pair of iterable collections, first, consisting of the values that are produced by f applied to this iterable collection elements contained in scala.util.Left and, second, all the values contained in scala.util.Right.

    Definition Classes
    IterableOps
  82. 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 view 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 view and as result type of product. Examples of such types are: Long, Float, Double, BigInt.

    Definition Classes
    IterableOnceOps
    Full Signature

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

  83. def reduce[B >: A](op: (B, B) ⇒ B): B

    Reduces the elements of this $coll using the specified associative binary operator.

    Reduces the elements of this $coll using the specified associative binary operator.

    $undefinedorder

    B

    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 $coll is nonempty.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this $coll is empty.

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

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

    Applies a binary operator to all elements of this $coll, going left to right. $willNotTerminateInf $orderDependentFold

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

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

    where x1, ..., xn are the elements of this $coll.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this $coll is empty.

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

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

    Optionally applies a binary operator to all elements of this $coll, going left to right. $willNotTerminateInf $orderDependentFold

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
  86. def reduceOption[B >: A](op: (B, B) ⇒ B): Option[B]

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

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

    $undefinedorder

    B

    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
    IterableOnceOps
  87. def reduceRight[B >: A](op: (A, B) ⇒ B): B

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

    Applies a binary operator to all elements of this $coll, going right to left. $willNotTerminateInf $orderDependentFold

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

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

    where x1, ..., xn are the elements of this $coll.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this $coll is empty.

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

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

    Optionally applies a binary operator to all elements of this $coll, going right to left. $willNotTerminateInf $orderDependentFold

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
  89. def reversed: Iterable[A]
    Attributes
    protected
    Definition Classes
    IterableOnceOps
  90. def scanLeft[B](z: B)(op: (B, A) ⇒ B): View[B]

    Produces a iterable collection containing cumulative results of applying the operator going left to right, including the initial value.

    Produces a iterable collection containing cumulative results of applying the operator going left to right, including the initial value.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    B

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Definition Classes
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesAndProducesIterator

  91. def scanRight[B](z: B)(op: (A, B) ⇒ B): View[B]

    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.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    Example:

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

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Definition Classes
    IterableOps
  92. def size: Int

    The size of this $coll.

    The size of this $coll.

    $willNotTerminateInf

    returns

    the number of elements in this $coll.

    Definition Classes
    IterableOnceOps
  93. def sizeCompare(that: Iterable[_]): Int

    Compares the size of this iterable collection to the size of another Iterable.

    Compares the size of this iterable collection to the size of another Iterable.

    that

    the Iterable whose size is compared with this iterable collection's size.

    x <  0       if this.size <  that.size
    x == 0       if this.size == that.size
    x >  0       if this.size >  that.size

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

    Definition Classes
    IterableOps
  94. def sizeCompare(otherSize: Int): Int

    Compares the size of this iterable collection to a test value.

    Compares the size of this iterable collection to a test value.

    otherSize

    the test value that gets compared with the size.

    returns

    A value x where

    x <  0       if this.size <  otherSize
    x == 0       if this.size == otherSize
    x >  0       if this.size >  otherSize

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

    Definition Classes
    IterableOps
  95. final def sizeIs: SizeCompareOps

    Returns a value class containing operations for comparing the size of this iterable collection to a test value.

    Returns a value class containing operations for comparing the size of this iterable collection to a test value.

    These operations are implemented in terms of sizeCompare(Int), and allow the following more readable usages:

    this.sizeIs < size     // this.sizeCompare(size) < 0
    this.sizeIs <= size    // this.sizeCompare(size) <= 0
    this.sizeIs == size    // this.sizeCompare(size) == 0
    this.sizeIs != size    // this.sizeCompare(size) != 0
    this.sizeIs >= size    // this.sizeCompare(size) >= 0
    this.sizeIs > size     // this.sizeCompare(size) > 0
    Definition Classes
    IterableOps
    Annotations
    @inline()
  96. def slice(from: Int, until: Int): View[A]

    Selects an interval of elements.

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

    from <= indexOf(x) < until

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    from

    the lowest index to include from this iterable collection.

    until

    the lowest index to EXCLUDE from this iterable collection.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesAndProducesIterator

  97. def sliding(size: Int, step: Int): Iterator[View[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

    returns

    An iterator producing iterable collections of size size, except the last element (which may be the only element) will be truncated if there are fewer than size elements remaining to be grouped.

    Definition Classes
    IterableOps
    See also

    scala.collection.Iterator, method sliding

  98. def sliding(size: Int): Iterator[View[A]]

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

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

    size

    the number of elements per group

    returns

    An iterator producing iterable collections of size size, except the last element (which may be the only element) will be truncated if there are fewer than size elements remaining to be grouped.

    Definition Classes
    IterableOps
    See also

    scala.collection.Iterator, method sliding

  99. def span(p: (A) ⇒ Boolean): (View[A], View[A])

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

    Splits this iterable collection 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.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    p

    the test predicate

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesOneAndProducesTwoIterators

  100. def splitAt(n: Int): (View[A], View[A])

    Splits this iterable collection into two at a given position.

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

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

    the position at which to split.

    returns

    a pair of iterable collections consisting of the first n elements of this iterable collection, and the other elements.

    Definition Classes
    IterableOps
  101. def stringPrefix: String
    Attributes
    protected[this]
    Definition Classes
    ViewIterable
  102. 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 view 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 view and as result type of sum. Examples of such types are: Long, Float, Double, BigInt.

    Definition Classes
    IterableOnceOps
    Full Signature

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

  103. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  104. def tail: View[A]

    The rest of the collection without its first element.

    The rest of the collection without its first element.

    Definition Classes
    IterableOps
  105. def tails: Iterator[View[A]]

    Iterates over the tails of this iterable collection.

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

    returns

    an iterator over all the tails of this iterable collection

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

  106. def take(n: Int): View[A]

    Selects first n elements.

    Selects first n elements.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

    the number of elements to take from this iterable collection.

    returns

    a iterable collection consisting only of the first n elements of this iterable collection, or else the whole iterable collection, if it has less than n elements. If n is negative, returns an empty iterable collection.

    Definition Classes
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesAndProducesIterator

  107. def takeRight(n: Int): View[A]

    A collection containing the last n elements of this collection.

    A collection containing the last n elements of this collection.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Definition Classes
    IterableOps
  108. def takeWhile(p: (A) ⇒ Boolean): View[A]

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
    Note

    Reuse: $consumesAndProducesIterator

  109. def to[C1](factory: Factory[A, C1]): C1

    Given a collection factory factory, convert this collection to the appropriate representation for the current element type A.

    Given a collection factory factory, convert this collection to the appropriate representation for the current element type A. Example uses:

    xs.to(List) xs.to(ArrayBuffer) xs.to(BitSet) // for xs: Iterable[Int]

    Definition Classes
    IterableOnceOps
  110. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

    Convert collection to array.

    Convert collection to array.

    Definition Classes
    IterableOnceOps
  111. final def toBuffer[B >: A]: Buffer[B]
    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  112. def toIndexedSeq: immutable.IndexedSeq[A]
    Definition Classes
    IterableOnceOps
  113. final def toIterable: Prepended.this.type

    returns

    This collection as an Iterable[A]. No new collection will be built if this is already an Iterable[A].

    Definition Classes
    IterableIterableOps
  114. def toList: immutable.List[A]
    Definition Classes
    IterableOnceOps
  115. def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
    Definition Classes
    IterableOnceOps
  116. def toSeq: immutable.Seq[A]

    returns

    This collection as a Seq[A]. This is equivalent to to(Seq) but might be faster.

    Definition Classes
    IterableOnceOps
  117. def toSet[B >: A]: immutable.Set[B]
    Definition Classes
    IterableOnceOps
  118. def toString(): String

    Converts this view to a string.

    Converts this view to a string.

    returns

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

    Definition Classes
    ViewIterable → AnyRef → Any
  119. def toVector: immutable.Vector[A]
    Definition Classes
    IterableOnceOps
  120. def transpose[B](implicit asIterable: (A) ⇒ Iterable[B]): View[View[B]]

    Transposes this iterable collection of iterable collections into a iterable collection of iterable collections.

    Transposes this iterable collection of iterable collections into a iterable collection of iterable collections.

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

    val xs = List(
               Set(1, 2, 3),
               Set(4, 5, 6)).transpose
    // xs == List(
    //         List(1, 4),
    //         List(2, 5),
    //         List(3, 6))
    
    val ys = Vector(
               List(1, 2, 3),
               List(4, 5, 6)).transpose
    // ys == Vector(
    //         Vector(1, 4),
    //         Vector(2, 5),
    //         Vector(3, 6))

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    B

    the type of the elements of each iterable collection.

    asIterable

    an implicit conversion which asserts that the element type of this iterable collection is an Iterable.

    returns

    a two-dimensional iterable collection of iterable collections which has as nth row the nth column of this iterable collection.

    Definition Classes
    IterableOps
    Exceptions thrown

    IllegalArgumentException if all collections in this iterable collection are not of the same size.

  121. def unzip[A1, A2](implicit asPair: (A) ⇒ (A1, A2)): (View[A1], View[A2])

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

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

    val xs = Iterable(
               (1, "one"),
               (2, "two"),
               (3, "three")).unzip
    // xs == (Iterable(1, 2, 3),
    //        Iterable(one, two, three))
    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 iterable collection is a pair.

    returns

    a pair of iterable collections, containing the first, respectively second half of each element pair of this iterable collection.

    Definition Classes
    IterableOps
  122. def unzip3[A1, A2, A3](implicit asTriple: (A) ⇒ (A1, A2, A3)): (View[A1], View[A2], View[A3])

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

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

    val xs = Iterable(
               (1, "one", '1'),
               (2, "two", '2'),
               (3, "three", '3')).unzip3
    // xs == (Iterable(1, 2, 3),
    //        Iterable(one, two, three),
    //        Iterable(1, 2, 3))
    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 iterable collection is a triple.

    returns

    a triple of iterable collections, containing the first, second, respectively third member of each element triple of this iterable collection.

    Definition Classes
    IterableOps
  123. def view: View[A]

    A view over the elements of this collection.

    A view over the elements of this collection.

    Definition Classes
    ViewIterableOps
  124. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  125. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  126. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @throws(classOf[java.lang.InterruptedException])
  127. def withFilter(p: (A) ⇒ Boolean): WithFilter[A, [_]View[_]]

    Creates a non-strict filter of this iterable collection.

    Creates a non-strict filter of this iterable collection.

    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.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    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 iterable collection which satisfy the predicate p.

    Definition Classes
    IterableOps
  128. def writeReplace(): AnyRef

    Create a proxy for Java serialization.

    Create a proxy for Java serialization. The default implementation will serialize all elements and deserialize by using a builder for CC via iterableFactory. Override in subclasses if more data needs to be preserved or a more efficient implementation is available. Override to return this in order to use self-serialization instead of a proxy.

    Attributes
    protected[this]
    Definition Classes
    ViewIterable
  129. def zip[B](that: IterableOnce[B]): View[(A, B)]

    Returns a iterable collection formed from this iterable collection and another iterable collection by combining corresponding elements in pairs.

    Returns a iterable collection formed from this iterable collection 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 iterable collection containing pairs consisting of corresponding elements of this iterable collection and that. The length of the returned collection is the minimum of the lengths of this iterable collection and that.

    Definition Classes
    IterableOps
  130. def zipAll[A1 >: A, B](that: Iterable[B], thisElem: A1, thatElem: B): View[(A1, B)]

    Returns a iterable collection formed from this iterable collection and another iterable collection by combining corresponding elements in pairs.

    Returns a iterable collection formed from this iterable collection 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.

    that

    the iterable providing the second half of each result pair

    thisElem

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

    thatElem

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

    returns

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

    Definition Classes
    IterableOps
  131. def zipWithIndex: View[(A, Int)]

    Zips this iterable collection with its indices.

    Zips this iterable collection with its indices.

    returns

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

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

    Note

    Reuse: $consumesAndProducesIterator

  132. def [B](y: B): (Prepended[A], B)
    Implicit
    This member is added by an implicit conversion from Prepended[A] toArrowAssoc[Prepended[A]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Deprecated Value Members

  1. def ++:[B >: A](that: IterableOnce[B]): IterableCC[B]
    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use xs ++ ys instead of ys ++: xs for xs of type Iterable

  2. def /:[B](z: B)(op: (B, A) ⇒ B): B
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    (Since version 2.13.0) Use .iterator.foldLeft instead

  3. final def /:[B](z: B)(op: (B, A) ⇒ B): B
    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use foldLeft instead of /:

  4. def :\[B](z: B)(op: (A, B) ⇒ B): B
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  5. final def :\[B](z: B)(op: (A, B) ⇒ B): B
    Definition Classes
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    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use foldRight instead of :\

  6. def aggregate[B](z: ⇒ B)(seqop: (B, A) ⇒ B, combop: (B, B) ⇒ B): B
    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) aggregate is not relevant for sequential collections. Use foldLeft(z)(seqop) instead.

  7. def collectFirst[B](f: PartialFunction[A, B]): Option[B]
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    (Since version 2.13.0) Use .iterator.collectFirst(...) instead

  8. def companion: IterableFactory[IterableCC]
    Definition Classes
    IterableOps
    Annotations
    @deprecated @deprecatedOverriding("Use iterableFactory instead", "2.13.0") @inline()
    Deprecated

    (Since version 2.13.0) Use iterableFactory instead

  9. def copyToBuffer(dest: Buffer[A]): Unit
    Implicit
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    (Since version 2.13.0) Use .iterator.copyToBuffer(...) instead

  10. final def copyToBuffer[B >: A](dest: Buffer[B]): Unit
    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use dest ++= coll instead

  11. def count(f: (A) ⇒ Boolean): Int
    Implicit
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    (Since version 2.13.0) Use .iterator.count(...) instead

  12. def exists(f: (A) ⇒ Boolean): Boolean
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    (Since version 2.13.0) Use .iterator.exists(...) instead

  13. def filter(f: (A) ⇒ Boolean): Iterator[A]
    Implicit
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  14. def find(p: (A) ⇒ Boolean): Option[A]
    Implicit
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    (Since version 2.13.0) Use .iterator.find instead

  15. def flatMap[B](f: (A) ⇒ IterableOnce[B]): IterableOnce[B]
    Implicit
    This member is added by an implicit conversion from Prepended[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Annotations
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    (Since version 2.13.0) Use .iterator.flatMap instead or consider requiring an Iterable

  16. def fold[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1
    Implicit
    This member is added by an implicit conversion from Prepended[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator.fold instead

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

    Folds the elements of this $coll using the specified associative binary operator.

    Folds the elements of this $coll using the specified associative binary operator. The default implementation in IterableOnce is equivalent to foldLeft but may be overridden for more efficient traversal orders.

    $undefinedorder $willNotTerminateInf

    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 the fold operator op between all the elements and z, or z if this $coll is empty.

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use foldLeft instead

  18. def foldLeft[B](z: B)(op: (B, A) ⇒ B): B
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    Deprecated

    (Since version 2.13.0) Use .iterator.foldLeft instead

  19. def foldRight[B](z: B)(op: (A, B) ⇒ B): B
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    Deprecated

    (Since version 2.13.0) Use .iterator.foldRight instead

  20. def forall(f: (A) ⇒ Boolean): Boolean
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    (Since version 2.13.0) Use .iterator.forall(...) instead

  21. def force: IndexedSeq[A]
    Definition Classes
    View
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Views no longer know about their underlying collection type; .force always returns an IndexedSeq

  22. def foreach[U](f: (A) ⇒ U): Unit
    Implicit
    This member is added by an implicit conversion from Prepended[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Deprecated

    (Since version 2.13.0) Use .iterator.foreach(...) instead

  23. final def hasDefiniteSize: Boolean
    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .knownSize >=0 instead of .hasDefiniteSize

  24. def isEmpty: Boolean
    Implicit
    This member is added by an implicit conversion from Prepended[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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  25. def map[B](f: (A) ⇒ B): IterableOnce[B]
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    This member is added by an implicit conversion from Prepended[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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  26. def max(implicit ord: math.Ordering[A]): A
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    This member is added by an implicit conversion from Prepended[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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  27. def maxBy[B](f: (A) ⇒ B)(implicit cmp: math.Ordering[B]): A
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    This member is added by an implicit conversion from Prepended[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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  28. def min(implicit ord: math.Ordering[A]): A
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  29. def minBy[B](f: (A) ⇒ B)(implicit cmp: math.Ordering[B]): A
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  30. def mkString: String
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    This member is added by an implicit conversion from Prepended[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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  31. def mkString(sep: String): String
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  32. def mkString(start: String, sep: String, end: String): String
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  33. def nonEmpty: Boolean
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  34. def product(implicit num: math.Numeric[A]): A
    Implicit
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  35. def reduce(f: (A, A) ⇒ A): A
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  36. def reduceLeft(f: (A, A) ⇒ A): A
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  37. def reduceLeftOption(f: (A, A) ⇒ A): Option[A]
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  38. def reduceOption(f: (A, A) ⇒ A): Option[A]
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  39. def reduceRight(f: (A, A) ⇒ A): A
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  40. def reduceRightOption(f: (A, A) ⇒ A): Option[A]
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  41. final def repr: View[A]
    Definition Classes
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    (Since version 2.13.0) Use coll instead of repr in a collection implementation, use the collection value itself from the outside

  42. def sameElements[B >: A](that: IterableOnce[B]): Boolean
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  43. def scan[B >: A](z: B)(op: (B, B) ⇒ B): View[B]

    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

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    returns

    a new iterable collection containing the prefix scan of the elements in this iterable collection

    Definition Classes
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    (Since version 2.13.0) Use scanLeft instead

  44. def seq: Prepended.this.type
    Definition Classes
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    (Since version 2.13.0) Iterable.seq always returns the iterable itself

  45. def size: Int
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  46. def sum(implicit num: math.Numeric[A]): A
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  47. def to[C1](factory: Factory[A, C1]): C1
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  48. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
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  49. def toBuffer[B >: A]: Buffer[B]
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  50. def toIndexedSeq: IndexedSeq[A]
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  51. final def toIterable: Iterable[A]
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  52. def toIterator: Iterator[A]
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  53. final def toIterator: Iterator[A]
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    (Since version 2.13.0) Use .iterator instead of .toIterator

  54. def toList: immutable.List[A]
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  55. def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
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  56. def toSeq: immutable.Seq[A]
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  57. def toSet[B >: A]: immutable.Set[B]
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  58. def toStream: immutable.Stream[A]
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  59. final def toStream: immutable.Stream[A]
    Definition Classes
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    (Since version 2.13.0) Use .to(LazyList) instead of .toStream

  60. final def toTraversable: Traversable[A]
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  61. final def toTraversable: Traversable[A]

    Converts this iterable collection to an unspecified Iterable.

    Converts this iterable collection to an unspecified Iterable. Will return the same collection if this instance is already Iterable.

    returns

    An Iterable containing all elements of this iterable collection.

    Definition Classes
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    (Since version 2.13.0) Use toIterable instead

  62. def toVector: immutable.Vector[A]
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  63. final def view(from: Int, until: Int): View[A]

    A view over a slice of the elements of this collection.

    A view over a slice of the elements of this collection.

    Definition Classes
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    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .view.slice(from, until) instead of .view(from, until)

  64. def withFilter(f: (A) ⇒ Boolean): Iterator[A]
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Inherited from AbstractView[A]

Inherited from View[A]

Inherited from AbstractIterable[A]

Inherited from Iterable[A]

Inherited from Serializable

Inherited from java.io.Serializable

Inherited from IterableOps[A, [_]View[_], View[A]]

Inherited from IterableOnceOps[A, [_]View[_], View[A]]

Inherited from IterableOnce[A]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion iterableOnceExtensionMethods fromPrepended[A] to IterableOnceExtensionMethods[A]

Inherited by implicit conversion any2stringadd fromPrepended[A] to any2stringadd[Prepended[A]]

Inherited by implicit conversion StringFormat fromPrepended[A] to StringFormat[Prepended[A]]

Inherited by implicit conversion Ensuring fromPrepended[A] to Ensuring[Prepended[A]]

Inherited by implicit conversion ArrowAssoc fromPrepended[A] to ArrowAssoc[Prepended[A]]

Ungrouped