DroppedWhile

Test two objects for inequality.

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

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

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

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)

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.

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.

Concatenates this collection with the elements of a traversable collection. It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one.

Concatenates this collection with the elements of a traversable collection. It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one.

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)

Applies a binary operator to a start value and all elements of this collection, 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

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

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

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

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

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

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

Test two objects for equality.

Appends all elements of this collection to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this collection 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

Appends all elements of this collection 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 collection, 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

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).

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.

Create a copy of the receiver object.

The default implementation of the clone method is platform dependent.

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

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

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

Note: may not terminate for infinite-sized collections.

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

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

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

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

Note: will not terminate for infinite-sized collections.

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

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

Note: will not terminate for infinite-sized collections.

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

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

Note: will not terminate for infinite-sized collections.

Copies all elements of this collection to a buffer.

Note: will not terminate for infinite-sized collections.

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

Selects all elements except first n ones.

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

Drops longest prefix of elements that satisfy a predicate.

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

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).

The equality method for reference types. See equals in Any.

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

Note: may not terminate for infinite-sized collections.

Selects all elements of this collection which satisfy a predicate.

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

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.

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

Note: may not terminate for infinite-sized collections.

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

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

Builds a new collection by applying a function to all elements of this 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 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 => 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)

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

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

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

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

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

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

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

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

Note: may not terminate for infinite-sized collections.

Applies a function f to all elements of this collection.

Applies a function f to all elements of this collection.

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

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

The nature of the representation is platform dependent.

Partitions this collection into a map of collections 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 collection.

Tests whether this collection 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.

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

Selects the first element of this collection.

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

Optionally selects the first element.

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

Selects all elements except the last.

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

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

Tests whether this collection is empty.

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.

Tests whether this collection can be repeatedly traversed.

Selects the last element.

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

Optionally selects the last element.

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

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

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

Finds the largest element.

Finds the largest element.

Finds the smallest element.

Finds the smallest element.

Equivalent to !(this eq that).

The builder that builds instances of type CC[A]

Boilerplate method, to override in each subclass This method could be eliminated if Scala had virtual classes

Tests whether the collection is not empty.

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

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

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.

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

Partitions this collection in two collections according to a predicate.

Multiplies up the elements of this collection.

Multiplies up the elements of this collection.

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

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

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

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

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

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

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

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

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

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

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

Computes a prefix scan of the elements of the collection.

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

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

Note: will not terminate for infinite-sized collections.

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

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

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.

The size of this collection.

Note: will not terminate for infinite-sized collections.

Selects an interval of elements. The returned 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.

Splits this 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.

Splits this 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.

Defines the prefix of this object's toString representation.

Sums up the elements of this collection.

Sums up the elements of this collection.

Selects all elements except the first.

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

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

Selects first n elements.

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

Takes longest prefix of elements that satisfy a predicate.

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

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

Converts this collection to an array.

Note: will not terminate for infinite-sized collections.

Converts this collection to an array.

Note: will not terminate for infinite-sized collections.

Converts this collection to a mutable buffer.

Note: will not terminate for infinite-sized collections.

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

Converts this collection to an indexed sequence.

Note: will not terminate for infinite-sized collections.

Converts this collection 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).

Note: will not terminate for infinite-sized collections.

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

Note: will not terminate for infinite-sized collections.

Converts this collection to a list.

Note: will not terminate for infinite-sized collections.

Converts this collection 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.

Note: will not terminate for infinite-sized collections.

Converts this collection 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.

Note: will not terminate for infinite-sized collections.

Converts this collection to a sequence. As with toIterable, it's lazy in this default implementation, as this TraversableOnce may be lazy and unevaluated.

Note: will not terminate for infinite-sized collections.

Converts this collection to a set.

Note: will not terminate for infinite-sized collections.

Converts this collection to a stream.

Note: will not terminate for infinite-sized collections.

Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

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

Note: will not terminate for infinite-sized collections.

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

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

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

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

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

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

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

Creates a non-strict view of this collection.

Creates a non-strict filter of this 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.