scala.collection.parallel.SeqSplitter
A flexible iterator for transforming an Iterator[A] into an
Iterator[Seq[A]], with configurable sequence size, step, and
strategy for dealing with elements which don't fit evenly.
Test two objects for inequality.
Test two objects for inequality.
true if !(this == that), false otherwise.
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.
a hash value consistent with ==
[use case]
the other iterator
a new iterator that first yields the values produced by this
iterator followed by the values produced by iterator that.
Applies a binary operator to a start value and all elements of this traversable or iterator, going left to right.
Applies a binary operator to a start value and all elements of this traversable or iterator, 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 iterators.
Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.
the result type of the binary operator.
the start value.
the binary operator.
the result of inserting op between consecutive elements of this traversable or iterator,
going left to right with the start value z on the left:
op(...op(op(z, x1), x2), ..., xn)
where x1, ..., xn are the elements of this traversable or iterator.
A syntactic sugar for out of order folding.
A syntactic sugar for out of order folding. See fold.
Example:
scala> val a = LinkedList(1,2,3,4)
a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
scala> val b = (a /:\ 5)(_+_)
b: Int = 15
Applies a binary operator to all elements of this traversable or iterator and a start value, going right to left.
Applies a binary operator to all elements of this traversable or iterator 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 iterators.
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
the result type of the binary operator.
the start value
the binary operator
the result of inserting op between consecutive elements of this traversable or iterator,
going right to left with the start value z on the right:
op(x1, op(x2, ... op(xn, z)...))
where x1, ..., xn are the elements of this traversable or iterator.
Test two objects for equality.
Test two objects for equality.
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
true if the receiver object is equivalent to the argument; false otherwise.
Sends an abort signal to other workers.
Sends an abort signal to other workers.
Abort flag being true means that a worker can abort and produce whatever result,
since its result will not affect the final result of computation. An example
of operations using this are find, forall and exists methods.
Appends all elements of this traversable or iterator to a string builder.
Appends all elements of this traversable or iterator to a string builder.
The written text consists of the string representations (w.r.t. the method
toString) of all elements of this traversable or iterator 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
the string builder to which elements are appended.
the string builder b to which elements were appended.
Appends all elements of this traversable or iterator to a string builder using a separator string.
Appends all elements of this traversable or iterator 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 traversable or iterator, 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
the string builder to which elements are appended.
the separator string.
the string builder b to which elements were appended.
Appends all elements of this traversable or iterator to a string builder using start, end, and separator strings.
Appends all elements of this traversable or iterator 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 traversable or iterator are separated by the string sep.
Example:
scala> val a = LinkedList(1,2,3,4)
a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
scala> val b = new StringBuilder()
b: StringBuilder =
scala> a.addString(b, "LinkedList(", ", ", ")")
res1: StringBuilder = LinkedList(1, 2, 3, 4)
the string builder to which elements are appended.
the starting string.
the separator string.
the ending string.
the string builder b to which elements were appended.
Aggregates the results of applying an operator to subsequent elements.
Aggregates the results of applying an operator to subsequent elements.
This is a more general form of fold and reduce. It has similar
semantics, but does not require the result to be a supertype of the
element type. It traverses the elements in different partitions
sequentially, using seqop to update the result, and then applies
combop to results from different partitions. The implementation of
this operation may operate on an arbitrary number of collection
partitions, so combop may be invoked an arbitrary number of times.
For example, one might want to process some elements and then produce
a Set. In this case, seqop would process an element and append it
to the list, while combop would concatenate two lists from different
partitions together. The initial value z would be an empty set.
pc.aggregate(Set[Int]())(_ += process(_), _ ++ _)
Another example is calculating geometric mean from a collection of doubles (one would typically require big doubles for this).
the type of accumulated results
the initial value for the accumulated result of the partition - this
will typically be the neutral element for the seqop operator (e.g.
Nil for list concatenation or 0 for summation)
an operator used to accumulate results within a partition
an associative operator used to combine results from different partitions
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.
the receiver object.
if the receiver object is not an instance of the erasure of type T0.
Creates a buffered iterator from this iterator.
Creates a buffered iterator from this iterator.
a buffered iterator producing the same values as this iterator.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
BufferedIterator
Create a copy of the receiver object.
Creates an iterator by transforming values produced by this iterator with a partial function, dropping those values for which the partial function is not defined.
Creates an iterator by transforming values produced by this iterator with a partial function, dropping those values for which the partial function is not defined.
the partial function which filters and maps the iterator.
a new iterator which yields each value x produced by this iterator for
which pf is defined the image pf(x).
(Changed in version 2.8.0) collect has changed. The previous behavior can be reproduced with toSeq.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Finds the first element of the traversable or iterator for which the given partial function is defined, and applies the partial function to it.
Finds the first element of the traversable or iterator for which the given partial function is defined, and applies the partial function to it.
Note: may not terminate for infinite iterators.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the partial function
an option value containing pf applied to the first
value for which it is defined, or None if none exists.
Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)
Tests whether this iterator contains a given value as an element.
Tests whether this iterator contains a given value as an element.
Note: may not terminate for infinite iterators.
the element to test.
true if this iterator produces some value that is
is equal (wrt ==) to elem, false otherwise.
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
[use case]
the array to fill.
the starting index.
the maximal number of elements to copy.
[use case]
the array to fill.
[use case]
the array to fill.
the starting index.
Copies all elements of this traversable or iterator to a buffer.
Copies all elements of this traversable or iterator to a buffer.
Note: will not terminate for infinite iterators.
The buffer to which elements are copied.
Counts the number of elements in the traversable or iterator which satisfy a predicate.
Counts the number of elements in the traversable or iterator which satisfy a predicate.
the predicate used to test elements.
the number of elements satisfying the predicate p.
Advances this iterator past the first n elements, or the length of the iterator, whichever is smaller.
Advances this iterator past the first n elements, or the length of the iterator, whichever is smaller.
the number of elements to drop
an iterator which produces all values of the current iterator, except
it omits the first n values.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Skips longest sequence of elements of this iterator which satisfy given
predicate p, and returns an iterator of the remaining elements.
Skips longest sequence of elements of this iterator which satisfy given
predicate p, and returns an iterator of the remaining elements.
the predicate used to skip elements.
an iterator consisting of the remaining elements
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Creates a copy of this iterator.
Creates a copy of this iterator.
Creates two new iterators that both iterate over the same elements as this iterator (in the same order).
Creates two new iterators that both iterate over the same elements as this iterator (in the same order). The duplicate iterators are considered equal if they are positioned at the same element.
Given that most methods on iterators will make the original iterator unfit for further use, this methods provides a reliable way of calling multiple such methods on an iterator.
a pair of iterators
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterators that were returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterators as well.
,The implementation may allocate temporary storage for elements iterated by one iterator but not yet by the other.
Tests whether the argument (arg0) is a reference to the receiver object (this).
Tests whether the argument (arg0) is a reference to the receiver object (this).
The eq method implements an equivalence relation on
non-null instances of AnyRef, and has three additional properties:
x and y of type AnyRef, multiple invocations of
x.eq(y) consistently returns true or consistently returns false.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).
true if the argument is a reference to the receiver object; false otherwise.
The equality method for reference types.
Tests whether a predicate holds for some of the values produced by this iterator.
Tests whether a predicate holds for some of the values produced by this iterator.
Note: may not terminate for infinite iterators.
the predicate used to test elements.
true if the given predicate p holds for some of the values
produced by this iterator, otherwise false.
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
Returns an iterator over all the elements of this iterator that satisfy the predicate p.
Returns an iterator over all the elements of this iterator that satisfy the predicate p.
The order of the elements is preserved.
the predicate used to test values.
an iterator which produces those values of this iterator which satisfy the predicate p.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Creates an iterator over all the elements of this iterator which do not satisfy a predicate p.
Creates an iterator over all the elements of this iterator which do not satisfy a predicate p.
the predicate used to test values.
an iterator which produces those values of this iterator which do not satisfy the predicate p.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
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.
Finds the first value produced by the iterator satisfying a predicate, if any.
Finds the first value produced by the iterator satisfying a predicate, if any.
Note: may not terminate for infinite iterators.
the predicate used to test values.
an option value containing the first value produced by the iterator that satisfies
predicate p, or None if none exists.
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
Creates a new iterator by applying a function to all values produced by this iterator and concatenating the results.
Creates a new iterator by applying a function to all values produced by this iterator and concatenating the results.
the function to apply on each element.
the iterator resulting from applying the given iterator-valued function
f to each value produced by this iterator and concatenating the results.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Folds the elements of this traversable or iterator using the specified associative binary operator.
Folds the elements of this traversable or iterator using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
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.)
a binary operator that must be associative
the result of applying fold operator op between all the elements and z
Applies a binary operator to a start value and all elements of this traversable or iterator, going left to right.
Applies a binary operator to a start value and all elements of this traversable or iterator, going left to right.
Note: will not terminate for infinite iterators.
Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.
the result type of the binary operator.
the start value.
the binary operator.
the result of inserting op between consecutive elements of this traversable or iterator,
going left to right with the start value z on the left:
op(...op(z, x1), x2, ..., xn)
where x1, ..., xn are the elements of this traversable or iterator.
Applies a binary operator to all elements of this traversable or iterator and a start value, going right to left.
Applies a binary operator to all elements of this traversable or iterator and a start value, going right to left.
Note: will not terminate for infinite iterators.
Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.
the result type of the binary operator.
the start value.
the binary operator.
the result of inserting op between consecutive elements of this traversable or iterator,
going right to left with the start value z on the right:
op(x1, op(x2, ... op(xn, z)...))
where x1, ..., xn are the elements of this traversable or iterator.
Tests whether a predicate holds for all values produced by this iterator.
Tests whether a predicate holds for all values produced by this iterator.
Note: may not terminate for infinite iterators.
the predicate used to test elements.
true if the given predicate p holds for all values
produced by this iterator, otherwise false.
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
[use case]
the function that is applied for its side-effect to every element.
The result of function f is discarded.
A representation that corresponds to the dynamic class of the receiver object.
A representation that corresponds to the dynamic class of the receiver object.
The nature of the representation is platform dependent.
a representation that corresponds to the dynamic class of the receiver object.
not specified by SLS as a member of AnyRef
Returns an iterator which groups this iterator into fixed size blocks.
Returns an iterator which groups this iterator into fixed size blocks. Example usages:
// Returns List(List(1, 2, 3), List(4, 5, 6), List(7))) (1 to 7).iterator grouped 3 toList // Returns List(List(1, 2, 3), List(4, 5, 6)) (1 to 7).iterator grouped 3 withPartial false toList // Returns List(List(1, 2, 3), List(4, 5, 6), List(7, 20, 25) // Illustrating that withPadding's argument is by-name. val it2 = Iterator.iterate(20)(_ + 5) (1 to 7).iterator grouped 3 withPadding it2.next toList
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Tests whether this Iterator has a known size.
Tests whether this Iterator has a known size.
true for empty Iterators, false otherwise.
Reuse: The iterator remains valid for further use whatever result is returned.
Tests whether this iterator can provide another element.
The hashCode method for reference types.
Returns the value of the index flag.
Returns the value of the index flag.
The index flag holds an integer which carries some operation-specific meaning. For
instance, takeWhile operation sets the index flag to the position of the element
where the predicate fails. Other workers may check this index against the indices
they are working on and return if this index is smaller than their index. Examples
of operations using this are takeWhile, dropWhile, span and indexOf.
the value of the index flag
Returns the index of the first occurrence of the specified object in this iterable object.
Returns the index of the first occurrence of the specified object in this iterable object.
Note: may not terminate for infinite iterators.
element to search for.
the index of the first occurrence of elem in the values produced by this iterator,
or -1 if such an element does not exist until the end of the iterator is reached.
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
Returns the index of the first produced value satisfying a predicate, or -1.
Returns the index of the first produced value satisfying a predicate, or -1.
Note: may not terminate for infinite iterators.
the index of the first produced value satisfying p,
or -1 if such an element does not exist until the end of the iterator is reached.
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
Checks whether an abort signal has been issued.
Checks whether an abort signal has been issued.
Abort flag being true means that a worker can abort and produce whatever result,
since its result will not affect the final result of computation. An example
of operations using this are find, forall and exists methods.
the state of the abort
Tests whether this iterator is empty.
Tests whether this iterator is empty.
true if hasNext is false, false otherwise.
Reuse: The iterator remains valid for further use whatever result is returned.
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.
true if the receiver object is an instance of erasure of type T0; false otherwise.
For most collections, this is a cheap operation.
For most collections, this is a cheap operation. Exceptions can override this method.
Tests whether this Iterator can be repeatedly traversed.
Tests whether this Iterator can be repeatedly traversed.
false
Reuse: The iterator remains valid for further use whatever result is returned.
Returns the number of elements in this iterator.
Returns the number of elements in this iterator.
Note: will not terminate for infinite iterators.
Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.
Creates a new iterator that maps all produced values of this iterator to new values using a transformation function.
Creates a new iterator that maps all produced values of this iterator to new values using a transformation function.
the transformation function
a new iterator which transforms every value produced by this
iterator by applying the function f to it.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
[use case]
the largest element of this traversable or iterator.
[use case]
the smallest element of this traversable or iterator
Displays all elements of this traversable or iterator in a string.
Displays all elements of this traversable or iterator in a string.
a string representation of this traversable or iterator. In the resulting string
the string representations (w.r.t. the method toString)
of all elements of this traversable or iterator follow each other without any
separator string.
Displays all elements of this traversable or iterator in a string using a separator string.
Displays all elements of this traversable or iterator in a string using a separator string.
the separator string.
a string representation of this traversable or iterator. In the resulting string
the string representations (w.r.t. the method toString)
of all elements of this traversable or iterator are separated by the string sep.
List(1, 2, 3).mkString("|") = "1|2|3"
Displays all elements of this traversable or iterator in a string using start, end, and separator strings.
Displays all elements of this traversable or iterator in a string using start, end, and separator strings.
the starting string.
the separator string.
the ending string.
a string representation of this traversable or iterator. 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 traversable or iterator are separated by
the string sep.
List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"
Equivalent to !(this eq that).
Equivalent to !(this eq that).
true if the argument is not a reference to the receiver object; false otherwise.
Produces the next element of this iterator.
Tests whether the traversable or iterator is not empty.
Tests whether the traversable or iterator is not empty.
true if the traversable or iterator contains at least one element, false otherwise.
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.
not specified by SLS as a member of AnyRef
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.
not specified by SLS as a member of AnyRef
[use case]
the target length
the padding value
a new iterator consisting of producing all values of this iterator,
followed by the minimal number of occurrences of elem so
that the number of produced values is at least len.
Partitions this iterator in two iterators according to a predicate.
Partitions this iterator in two iterators according to a predicate.
the predicate on which to partition
a pair of iterators: the iterator that satisfies the predicate
p and the iterator that does not.
The relative order of the elements in the resulting iterators
is the same as in the original iterator.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterators that were returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterators as well.
Returns this iterator with patched values.
Returns this iterator with patched values.
The start index from which to patch
The iterator of patch values
The number of values in the original iterator that are replaced by the patch.
Reuse: After calling this method, one should discard the iterator it was called on, as well as the one passed as a parameter, and use only the iterator that was returned. Using the old iterators is undefined, subject to change, and may result in changes to the new iterator as well.
[use case]
the product of all elements in this traversable or iterator 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 traversable or iterator and as result type of product.
Examples of such types are: Long, Float, Double, BigInt.
Splits the splitter into disjunct views.
Splits the splitter into disjunct views.
This overloaded version of the split method is specific to precise splitters.
It returns a sequence of splitters, each iterating some subset of the
elements in this splitter. The sizes of the subsplitters in the partition is equal to
the size in the corresponding argument, as long as there are enough elements in this
splitter to split it that way.
If there aren't enough elements, a zero element splitter is appended for each additional argument. If there are additional elements, an additional splitter is appended at the end to compensate.
For example, say we have a splitter ps with 100 elements. Invoking:
ps.split(50, 25, 25, 10, 5)
will return a sequence of five splitters, last two views being empty. On the other hand, calling:
ps.split(50, 40)
will return a sequence of three splitters, last of them containing ten elements.
Note: this method actually invalidates the current splitter.
Unlike the case with split found in splitters, views returned by this method can be empty.
the sizes used to split this split iterator into iterators that traverse disjunct subsets
a sequence of disjunct subsequence iterators of this parallel iterator
Reduces the elements of this traversable or iterator using the specified associative binary operator.
Reduces the elements of this traversable or iterator using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
A binary operator that must be associative.
The result of applying reduce operator op between all the elements if the traversable or iterator is nonempty.
if this traversable or iterator is empty.
Optionally applies a binary operator to all elements of this traversable or iterator, going left to right.
Optionally applies a binary operator to all elements of this traversable or iterator, going left to right.
Note: will not terminate for infinite iterators.
Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.
the result type of the binary operator.
the binary operator.
an option value containing the result of reduceLeft(op) is this traversable or iterator is nonempty,
None otherwise.
Reduces the elements of this traversable or iterator, if any, using the specified associative binary operator.
Reduces the elements of this traversable or iterator, if any, using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
A type parameter for the binary operator, a supertype of A.
A binary operator that must be associative.
An option value containing result of applying reduce operator op between all
the elements if the collection is nonempty, and None otherwise.
Applies a binary operator to all elements of this traversable or iterator, going right to left.
Applies a binary operator to all elements of this traversable or iterator, going right to left.
Note: will not terminate for infinite iterators.
Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.
the result type of the binary operator.
the binary operator.
the result of inserting op between consecutive elements of this traversable or iterator,
going right to left:
op(x,,1,,, op(x,,2,,, ..., op(x,,n-1,,, x,,n,,)...))
where x1, ..., xn are the elements of this traversable or iterator.
if this traversable or iterator is empty.
Optionally applies a binary operator to all elements of this traversable or iterator, going right to left.
Optionally applies a binary operator to all elements of this traversable or iterator, going right to left.
Note: will not terminate for infinite iterators.
Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.
the result type of the binary operator.
the binary operator.
an option value containing the result of reduceRight(op) is this traversable or iterator is nonempty,
None otherwise.
The number of elements this iterator has yet to traverse.
The number of elements this iterator has yet to traverse. This method doesn't change the state of the iterator.
This method is used to provide size hints to builders and combiners, and to approximate positions of iterators within a data structure.
Note: This method may be implemented to return an upper bound on the number of elements in the iterator, instead of the exact number of elements to iterate. Parallel collections which have such iterators are called non-strict-splitter collections.
In that case, 2 considerations must be taken into account:
1) classes that inherit ParIterable must reimplement methods take, drop, slice, splitAt, copyToArray
and all others using this information.
2) if an iterator provides an upper bound on the number of elements, then after splitting the sum
of remaining values of split iterators must be less than or equal to this upper bound.
Tests if another iterator produces the same values as this one.
Tests if another iterator produces the same values as this one.
Note: will not terminate for infinite iterators.
the other iterator
true, if both iterators produce the same elements in the same order, false otherwise.
Reuse: After calling this method, one should discard the iterator it was called on, as well as the one passed as parameter. Using the old iterators is undefined and subject to change.
Produces a collection containing cummulative results of applying the operator going left to right.
Produces a collection containing cummulative results of applying the operator going left to right.
Note: will not terminate for infinite iterators.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the type of the elements in the resulting collection
the initial value
the binary operator applied to the intermediate result and the element
iterator with intermediate results
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Produces a collection containing cummulative results of applying the operator going right to left.
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 iterators.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the type of the elements in the resulting collection
the initial value
the binary operator applied to the intermediate result and the element
iterator with intermediate results
Iterator(1, 2, 3, 4).scanRight(0)(_ + _).toList == List(10, 9, 7, 4, 0)
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
A version of this collection with all of the operations implemented sequentially (i.
A version of this collection with all of the operations implemented sequentially (i.e. in a single-threaded manner).
This method returns a reference to this collection. In parallel collections, it is redefined to return a sequential implementation of this collection. In both cases, it has O(1) complexity.
a sequential view of the collection.
Sets the value of the index flag.
Sets the value of the index flag.
The index flag holds an integer which carries some operation-specific meaning. For
instance, takeWhile operation sets the index flag to the position of the element
where the predicate fails. Other workers may check this index against the indices
they are working on and return if this index is smaller than their index. Examples
of operations using this are takeWhile, dropWhile, span and indexOf.
the value to which the index flag is set.
Sets the value of the index flag if argument is greater than current value.
Sets the value of the index flag if argument is greater than current value. This method does this atomically.
The index flag holds an integer which carries some operation-specific meaning. For
instance, takeWhile operation sets the index flag to the position of the element
where the predicate fails. Other workers may check this index against the indices
they are working on and return if this index is smaller than their index. Examples
of operations using this are takeWhile, dropWhile, span and indexOf.
the value to which the index flag is set
Sets the value of the index flag if argument is lesser than current value.
Sets the value of the index flag if argument is lesser than current value. This method does this atomically.
The index flag holds an integer which carries some operation-specific meaning. For
instance, takeWhile operation sets the index flag to the position of the element
where the predicate fails. Other workers may check this index against the indices
they are working on and return if this index is smaller than their index. Examples
of operations using this are takeWhile, dropWhile, span and indexOf.
the value to which the index flag is set
A delegate that method calls are redirected to.
A delegate that method calls are redirected to.
The size of this traversable or iterator.
The size of this traversable or iterator.
Note: will not terminate for infinite iterators.
the number of elements in this traversable or iterator.
Creates an iterator returning an interval of the values produced by this iterator.
Creates an iterator returning an interval of the values produced by this iterator.
an iterator which advances this iterator past the first from elements using drop,
and then takes until - from elements, using take.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Returns an iterator which presents a "sliding window" view of another iterator.
Returns an iterator which presents a "sliding window" view of
another iterator. The first argument is the window size, and
the second is how far to advance the window on each iteration;
defaults to 1. Example usages:
// Returns List(List(1, 2, 3), List(2, 3, 4), List(3, 4, 5)) (1 to 5).iterator.sliding(3).toList // Returns List(List(1, 2, 3, 4), List(4, 5)) (1 to 5).iterator.sliding(4, 3).toList // Returns List(List(1, 2, 3, 4)) (1 to 5).iterator.sliding(4, 3).withPartial(false).toList // Returns List(List(1, 2, 3, 4), List(4, 5, 20, 25)) // Illustrating that withPadding's argument is by-name. val it2 = Iterator.iterate(20)(_ + 5) (1 to 5).iterator.sliding(4, 3).withPadding(it2.next).toList
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Splits this Iterator into a prefix/suffix pair according to a predicate.
Splits this Iterator into a prefix/suffix pair according to a predicate.
the test predicate
a pair of Iterators consisting of the longest prefix of this
whose elements all satisfy p, and the rest of the Iterator.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterators that were returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterators as well.
Splits the iterator into a sequence of disjunct views.
Splits the iterator into a sequence of disjunct views.
Returns a sequence of split iterators, each iterating over some subset of the elements in the collection. These subsets are disjoint and should be approximately equal in size. These subsets are not empty, unless the iterator is empty in which case this method returns a sequence with a single empty iterator. If the splitter has more than two elements, this method will return two or more splitters.
Implementors are advised to keep this partition relatively small - two splitters are already enough when partitioning the collection, although there may be a few more.
Note: this method actually invalidates the current splitter.
a sequence of disjunct iterators of the collection
[use case]
the sum of all elements in this traversable or iterator 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 traversable or iterator and as result type of sum.
Examples of such types are: Long, Float, Double, BigInt.
A read only tag specific to the signalling object.
A read only tag specific to the signalling object. It is used to give specific workers information on the part of the collection being operated on.
Selects first n values of this iterator.
Selects first n values of this iterator.
the number of values to take
an iterator producing only of the first n values of this iterator, or else the
whole iterator, if it produces fewer than n values.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Takes longest prefix of values produced by this iterator that satisfy a predicate.
Takes longest prefix of values produced by this iterator that satisfy a predicate.
The predicate used to test elements.
An iterator returning the values produced by this iterator, until
this iterator produces a value that does not satisfy
the predicate p.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
[use case]
an array containing all elements of this traversable or iterator.
A ClassManifest must be available for the element type of this traversable or iterator.
Converts this traversable or iterator to a mutable buffer.
Converts this traversable or iterator to a mutable buffer.
Note: will not terminate for infinite iterators.
a buffer containing all elements of this traversable or iterator.
Converts this traversable or iterator to an indexed sequence.
Converts this traversable or iterator to an indexed sequence.
Note: will not terminate for infinite iterators.
an indexed sequence containing all elements of this traversable or iterator.
Converts this traversable or iterator to an iterable collection.
Converts this traversable or iterator 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 iterators.
an Iterable containing all elements of this traversable or iterator.
Returns an Iterator over the elements in this traversable or iterator.
Returns an Iterator over the elements in this traversable or iterator. Will return the same Iterator if this instance is already an Iterator.
Note: will not terminate for infinite iterators.
an Iterator containing all elements of this traversable or iterator.
Converts this traversable or iterator to a list.
Converts this traversable or iterator to a list.
Note: will not terminate for infinite iterators.
a list containing all elements of this traversable or iterator.
[use case]
a map of type immutable.Map[T, U]
containing all key/value pairs of type (T, U) of this traversable or iterator.
Converts this traversable or iterator to a sequence.
Converts this traversable or iterator 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 iterators.
a sequence containing all elements of this traversable or iterator.
Converts this traversable or iterator to a set.
Converts this traversable or iterator to a set.
Note: will not terminate for infinite iterators.
a set containing all elements of this traversable or iterator.
Converts this traversable or iterator to a stream.
Converts this traversable or iterator to a stream.
Note: will not terminate for infinite iterators.
a stream containing all elements of this traversable or iterator.
Converts this iterator to a string.
Converts this traversable or iterator to an unspecified Traversable.
Converts this traversable or iterator to an unspecified Traversable. Will return the same collection if this instance is already Traversable.
Note: will not terminate for infinite iterators.
a Traversable containing all elements of this traversable or iterator.
Creates an iterator over all the elements of this iterator that
satisfy the predicate p.
Creates an iterator over all the elements of this iterator that
satisfy the predicate p. The order of the elements
is preserved.
Note: withFilter is the same as filter on iterators. It exists so that
for-expressions with filters work over iterators.
the predicate used to test values.
an iterator which produces those values of this iterator which satisfy the predicate p.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.
Creates an iterator formed from this iterator and another iterator by combining corresponding values in pairs.
Creates an iterator formed from this iterator and another iterator by combining corresponding values in pairs. If one of the two iterators is longer than the other, its remaining elements are ignored.
The iterator providing the second half of each result pair
a new iterator containing pairs consisting of
corresponding elements of this iterator and that. The number
of elements returned by the new iterator is the
minimum of the number of elements returned by this
iterator and that.
Reuse: After calling this method, one should discard the iterator it was called on, as well as the one passed as a parameter, and use only the iterator that was returned. Using the old iterators is undefined, subject to change, and may result in changes to the new iterator as well.
[use case]
iterator that may have a different length
as the self iterator.
element thisElem is used to fill up the
resulting iterator if the self iterator is shorter than
that
element thatElem is used to fill up the
resulting iterator if that is shorter than
the self iterator
a new iterator containing pairs consisting of
corresponding values of this iterator and that. The length
of the returned iterator is the maximum of the lengths of this iterator and that.
If this iterator is shorter than that, thisElem values are used to pad the result.
If that is shorter than this iterator, thatElem values are used to pad the result.
Creates an iterator that pairs each element produced by this iterator with its index, counting from 0.
Creates an iterator that pairs each element produced by this iterator with its index, counting from 0.
a new iterator containing pairs consisting of corresponding elements of this iterator and their indices.
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.