Class scala.collection.Iterator.GroupedIterator

class GroupedIterator[B >: A] extends AbstractIterator[Seq[B]] with Iterator[Seq[B]]

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.

Typical uses can be achieved via methods grouped and sliding.

Source: Iterator.scala

Linear Supertypes

Instance Constructors

new GroupedIterator(self: Iterator[A], size: Int, step: Int)

Type Members

class GroupedIterator[B >: A] extends AbstractIterator[Seq[B]] with Iterator[Seq[B]]

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.

Typical uses can be achieved via methods grouped and sliding.

Definition Classes: Iterator

Value Members

final def !=(arg0: Any): Boolean

Test two objects for inequality.

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

Definition Classes: AnyRef → Any

final def ##(): Int

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

def +(other: String): String

Implicit: This member is added by an implicit conversion from GroupedIterator[B] to any2stringadd[GroupedIterator[B]] performed by method any2stringadd in scala.Predef.
Definition Classes: any2stringadd

def ++(that: ⇒ Iterator[Seq[B]]): Iterator[Seq[B]]

[use case]

Concatenates this iterator with another.

that: the other iterator
returns: a new iterator that first yields the values produced by this iterator followed by the values produced by iterator that.

Definition Classes: Iterator

def ->[B](y: B): (GroupedIterator[B], B)

Implicit: This member is added by an implicit conversion from GroupedIterator[B] to ArrowAssoc[GroupedIterator[B]] performed by method ArrowAssoc in scala.Predef.
Definition Classes: ArrowAssoc
Annotations: @inline()

def /:[B](z: B)(op: (B, Seq[B]) ⇒ B): B

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 = List(1,2,3,4)
a: List[Int] = List(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.

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 traversable or iterator, going left to right with the start value z on the left:

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

where x₁, ..., x_n are the elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def :\[B](z: B)(op: (Seq[B], B) ⇒ B): B

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-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 = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = (a :\ 5)(_+_)
b: Int = 15

scala> val c = (a :\ 5)((x,y) => x + y)
c: Int = 15

B

the result type of the binary operator.

z

the start value

op

the binary operator

returns

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

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

where x₁, ..., x_n are the elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

final def ==(arg0: Any): Boolean

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

def addString(b: StringBuilder): StringBuilder

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 = 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: TraversableOnce

def addString(b: StringBuilder, sep: String): StringBuilder

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 = 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: TraversableOnce

def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder

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 = 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: TraversableOnce

def aggregate[B](z: ⇒ B)(seqop: (B, Seq[B]) ⇒ B, combop: (B, B) ⇒ B): B

Aggregates the results of applying an operator to subsequent elements.

This is a more general form of fold and reduce. It is similar to foldLeft in that it doesn't require the result to be a supertype of the element type. In addition, it allows parallel collections to be processed in chunks, and then combines the intermediate results.

aggregate splits the traversable or iterator into partitions and processes each partition by sequentially applying seqop, starting with z (like foldLeft). Those intermediate results are then combined by using combop (like fold). The implementation of this operation may operate on an arbitrary number of collection partitions (even 1), so combop may be invoked an arbitrary number of times (even 0).

As an example, consider summing up the integer values of a list of chars. The initial value for the sum is 0. First, seqop transforms each input character to an Int and adds it to the sum (of the partition). Then, combop just needs to sum up the intermediate results of the partitions:

List('a', 'b', 'c').aggregate(0)({ (sum, ch) => sum + ch.toInt }, { (p1, p2) => p1 + p2 })

B: the type of accumulated results
z: the initial value for the accumulated result of the partition - this will typically be the neutral element for the seqop operator (e.g. Nil for list concatenation or 0 for summation) and may be evaluated more than once
seqop: an operator used to accumulate results within a partition
combop: an associative operator used to combine results from different partitions

Definition Classes: TraversableOnce → GenTraversableOnce

final def asInstanceOf[T0]: 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.

def buffered: BufferedIterator[Seq[B]]

Creates a buffered iterator from this iterator.

returns: a buffered iterator producing the same values as this iterator.

Definition Classes: Iterator
Note: 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.
See also: scala.collection.BufferedIterator

def clone(): AnyRef

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[lang]
Definition Classes: AnyRef
Annotations: @throws( ... ) @native()
Note: not specified by SLS as a member of AnyRef

def collect[B](pf: PartialFunction[Seq[B], B]): Iterator[B]

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.

pf: the partial function which filters and maps the iterator.
returns: a new iterator which yields each value x produced by this iterator for which pf is defined the image pf(x).

Definition Classes: Iterator
Annotations: @migration
Migration: (Changed in version 2.8.0) collect has changed. The previous behavior can be reproduced with toSeq.
Note: 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.

def collectFirst[B](pf: PartialFunction[Seq[B], B]): Option[B]

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-sized collections.

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

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

Definition Classes: TraversableOnce

def contains(elem: Any): Boolean

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

Note: may not terminate for infinite iterators.

elem: the element to test.
returns: true if this iterator produces some value that is is equal (as determined by ==) to elem, false otherwise.

Definition Classes: Iterator
Note: Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

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

[use case]

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

Note: will not terminate for infinite iterators.

xs: the array to fill.
start: the starting index.
len: the maximal number of elements to copy.

Definition Classes: Iterator → TraversableOnce → GenTraversableOnce

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

[use case]

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

Note: will not terminate for infinite iterators.

xs: the array to fill.

Definition Classes: TraversableOnce → GenTraversableOnce

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

[use case]

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

Note: will not terminate for infinite iterators.

xs: the array to fill.
start: the starting index.

Definition Classes: TraversableOnce → GenTraversableOnce

def copyToBuffer[B >: Seq[B]](dest: Buffer[B]): Unit

Copies all elements of this traversable or iterator to a buffer.

Note: will not terminate for infinite-sized collections.

dest: The buffer to which elements are copied.

Definition Classes: TraversableOnce

def corresponds[B](that: GenTraversableOnce[B])(p: (Seq[B], B) ⇒ Boolean): Boolean

Tests whether every element of this 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: Iterator

def count(p: (Seq[B]) ⇒ Boolean): Int

Counts the number of elements in the traversable or iterator which satisfy a predicate.

p: the predicate used to test elements.
returns: the number of elements satisfying the predicate p.

Definition Classes: TraversableOnce → GenTraversableOnce

def drop(n: Int): Iterator[Seq[B]]

Advances this iterator past the first n elements, or the length of the iterator, whichever is smaller.

n: the number of elements to drop
returns: an iterator which produces all values of the current iterator, except it omits the first n values.

Definition Classes: Iterator
Note: 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.

def dropWhile(p: (Seq[B]) ⇒ Boolean): Iterator[Seq[B]]

Skips longest sequence of elements of this iterator which satisfy given predicate p, and returns an iterator of the remaining elements.

p: the predicate used to skip elements.
returns: an iterator consisting of the remaining elements

Definition Classes: Iterator
Note: 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.

def duplicate: (Iterator[Seq[B]], Iterator[Seq[B]])

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.

returns: a pair of iterators

Definition Classes: Iterator
Note: The implementation may allocate temporary storage for elements iterated by one iterator but not yet by the other.
,
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.

def ensuring(cond: (GroupedIterator[B]) ⇒ Boolean, msg: ⇒ Any): GroupedIterator[B]

Implicit: This member is added by an implicit conversion from GroupedIterator[B] to Ensuring[GroupedIterator[B]] performed by method Ensuring in scala.Predef.
Definition Classes: Ensuring

def ensuring(cond: (GroupedIterator[B]) ⇒ Boolean): GroupedIterator[B]

Implicit: This member is added by an implicit conversion from GroupedIterator[B] to Ensuring[GroupedIterator[B]] performed by method Ensuring in scala.Predef.
Definition Classes: Ensuring

def ensuring(cond: Boolean, msg: ⇒ Any): GroupedIterator[B]

Implicit: This member is added by an implicit conversion from GroupedIterator[B] to Ensuring[GroupedIterator[B]] performed by method Ensuring in scala.Predef.
Definition Classes: Ensuring

def ensuring(cond: Boolean): GroupedIterator[B]

Implicit: This member is added by an implicit conversion from GroupedIterator[B] to Ensuring[GroupedIterator[B]] performed by method Ensuring in scala.Predef.
Definition Classes: Ensuring

final def eq(arg0: AnyRef): Boolean

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:

x

y

AnyRef

x.eq(y)

true

false

x

AnyRef

x.eq(null)

null.eq(x)

false

null.eq(null)

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

def equals(arg0: Any): Boolean

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

def exists(p: (Seq[B]) ⇒ Boolean): Boolean

Tests whether a predicate holds for some of the values produced by this iterator.

Note: may not terminate for infinite iterators.

p: the predicate used to test elements.
returns: true if the given predicate p holds for some of the values produced by this iterator, otherwise false.

Definition Classes: Iterator → TraversableOnce → GenTraversableOnce
Note: Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

def filter(p: (Seq[B]) ⇒ Boolean): Iterator[Seq[B]]

Returns an iterator over all the elements of this iterator that satisfy the predicate p. The order of the elements is preserved.

p: the predicate used to test values.
returns: an iterator which produces those values of this iterator which satisfy the predicate p.

Definition Classes: Iterator
Note: 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.

def filterNot(p: (Seq[B]) ⇒ Boolean): Iterator[Seq[B]]

Creates an iterator over all the elements of this iterator which do not satisfy a predicate p.

p: the predicate used to test values.
returns: an iterator which produces those values of this iterator which do not satisfy the predicate p.

Definition Classes: Iterator
Note: 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.

def finalize(): Unit

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[lang]
Definition Classes: AnyRef
Annotations: @throws( classOf[java.lang.Throwable] )
Note: not specified by SLS as a member of AnyRef

def find(p: (Seq[B]) ⇒ Boolean): Option[Seq[B]]

Finds the first value produced by the iterator satisfying a predicate, if any.

Note: may not terminate for infinite iterators.

p: the predicate used to test values.
returns: an option value containing the first value produced by the iterator that satisfies predicate p, or None if none exists.

Definition Classes: Iterator → TraversableOnce → GenTraversableOnce
Note: Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

def flatMap[B](f: (Seq[B]) ⇒ GenTraversableOnce[B]): Iterator[B]

Creates a new iterator by applying a function to all values produced by this iterator and concatenating the results.

f: the function to apply on each element.
returns: the iterator resulting from applying the given iterator-valued function f to each value produced by this iterator and concatenating the results.

Definition Classes: Iterator
Note: 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.

def flatten: Iterator[B]

Implicit: This member is added by an implicit conversion from GroupedIterator[B] to FlattenOps[B] performed by method flattenTraversableOnce in scala.collection.TraversableOnce. This conversion will take place only if an implicit value of type (Seq[B]) ⇒ TraversableOnce[B] is in scope.
Definition Classes: FlattenOps

def fold[A1 >: Seq[B]](z: A1)(op: (A1, A1) ⇒ A1): A1

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.

Note: will not terminate for infinite-sized collections.

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 traversable or iterator is empty.

Definition Classes: TraversableOnce → GenTraversableOnce

def foldLeft[B](z: B)(op: (B, Seq[B]) ⇒ B): B

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-sized collections.

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

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 traversable or iterator, going left to right with the start value z on the left:

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

where x₁, ..., x_n are the elements of this traversable or iterator. Returns z if this traversable or iterator is empty.

Definition Classes: TraversableOnce → GenTraversableOnce

def foldRight[B](z: B)(op: (Seq[B], B) ⇒ B): B

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-sized collections.

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

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 traversable or iterator, going right to left with the start value z on the right:

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

where x₁, ..., x_n are the elements of this traversable or iterator. Returns z if this traversable or iterator is empty.

Definition Classes: TraversableOnce → GenTraversableOnce

def forall(p: (Seq[B]) ⇒ Boolean): Boolean

Tests whether a predicate holds for all values produced by this iterator.

Note: may not terminate for infinite iterators.

p: the predicate used to test elements.
returns: true if the given predicate p holds for all values produced by this iterator, otherwise false.

Definition Classes: Iterator → TraversableOnce → GenTraversableOnce
Note: Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

def foreach(f: (Seq[B]) ⇒ Unit): Unit

[use case]

Applies a function f to all values produced by this iterator.

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

Definition Classes: Iterator → TraversableOnce → GenTraversableOnce

def formatted(fmtstr: String): 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 GroupedIterator[B] to StringFormat[GroupedIterator[B]] performed by method StringFormat in scala.Predef.
Definition Classes: StringFormat
Annotations: @inline()

final def getClass(): Class[_]

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()

def grouped[B >: Seq[B]](size: Int): GroupedIterator[B]

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

Definition Classes: Iterator
Note: 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.

def hasDefiniteSize: Boolean

Tests whether this Iterator has a known size.

returns: true for empty Iterators, false otherwise.

Definition Classes: Iterator → TraversableOnce → GenTraversableOnce
Note: Reuse: The iterator remains valid for further use whatever result is returned.

def hasNext: Boolean

Tests whether this iterator can provide another element.

returns: true if a subsequent call to next will yield an element, false otherwise.

Definition Classes: GroupedIterator → Iterator
Note: Reuse: The iterator remains valid for further use whatever result is returned.

def hashCode(): Int

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()

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

Returns the index of the first occurrence of the specified object in this iterable object after or at some start index.

Note: may not terminate for infinite iterators.

elem: element to search for.
from: the start index
returns: the index >= from 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.

Definition Classes: Iterator
Note: Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

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

Returns the index of the first occurrence of the specified object in this iterable object.

Note: may not terminate for infinite iterators.

elem: element to search for.
returns: 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.

Definition Classes: Iterator
Note: Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

def indexWhere(p: (Seq[B]) ⇒ Boolean, from: Int): Int

Returns the index of the first produced value satisfying a predicate, or -1, after or at some start index.

Note: may not terminate for infinite iterators.

p: the predicate to test values
from: the start index
returns: the index >= from of the first produced value satisfying p, or -1 if such an element does not exist until the end of the iterator is reached.

Definition Classes: Iterator
Note: Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

def indexWhere(p: (Seq[B]) ⇒ Boolean): Int

Returns the index of the first produced value satisfying a predicate, or -1.

Note: may not terminate for infinite iterators.

p: the predicate to test values
returns: 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.

Definition Classes: Iterator
Note: Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

def isEmpty: Boolean

Tests whether this iterator is empty.

returns: true if hasNext is false, false otherwise.

Definition Classes: Iterator → TraversableOnce → GenTraversableOnce
Note: Reuse: The iterator remains valid for further use whatever result is returned.

final def isInstanceOf[T0]: Boolean

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

def isTraversableAgain: Boolean

Tests whether this Iterator can be repeatedly traversed.

returns: false

Definition Classes: Iterator → GenTraversableOnce
Note: Reuse: The iterator remains valid for further use whatever result is returned.

def length: Int

Returns the number of elements in this iterator.

Note: will not terminate for infinite iterators.

Definition Classes: Iterator
Note: Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

def map[B](f: (Seq[B]) ⇒ B): Iterator[B]

Creates a new iterator that maps all produced values of this iterator to new values using a transformation function.

f: the transformation function
returns: a new iterator which transforms every value produced by this iterator by applying the function f to it.

Definition Classes: Iterator
Note: 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.

def max: A

[use case]

Finds the largest element.

returns: the largest element of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this traversable or iterator is empty.

def maxBy[B](f: (A) ⇒ B): A

[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 traversable or iterator with the largest value measured by function f.

Definition Classes: TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this traversable or iterator is empty.

def min: A

[use case]

Finds the smallest element.

returns: the smallest element of this traversable or iterator

Definition Classes: TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this traversable or iterator is empty.

def minBy[B](f: (A) ⇒ B): A

[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 traversable or iterator with the smallest value measured by function f.

Definition Classes: TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this traversable or iterator is empty.

def mkString: String

Displays all elements of this traversable or iterator in a string.

returns: 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.

Definition Classes: TraversableOnce → GenTraversableOnce

def mkString(sep: String): String

Displays all elements of this traversable or iterator in a string using a separator string.

sep: the separator string.
returns: 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.

Definition Classes: TraversableOnce → GenTraversableOnce

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

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

start: the starting string.
sep: the separator string.
end: the ending string.
returns: a string representation of this 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.

Definition Classes: TraversableOnce → GenTraversableOnce

final def ne(arg0: AnyRef): Boolean

Equivalent to !(this eq that).

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

Definition Classes: AnyRef

def next(): List[B]

Produces the next element of this iterator.

returns: the next element of this iterator, if hasNext is true, undefined behavior otherwise.

Definition Classes: GroupedIterator → Iterator
Note: Reuse: The iterator remains valid for further use whatever result is returned.

def nonEmpty: Boolean

Tests whether the traversable or iterator is not empty.

returns: true if the traversable or iterator contains at least one element, false otherwise.

Definition Classes: TraversableOnce → GenTraversableOnce

final def notify(): Unit

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

final def notifyAll(): Unit

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

def padTo(len: Int, elem: Seq[B]): Iterator[Seq[B]]

[use case]

Appends an element value to this iterator until a given target length is reached.

len: the target length
elem: the padding value
returns: 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.

Definition Classes: Iterator

def partition(p: (Seq[B]) ⇒ Boolean): (Iterator[Seq[B]], Iterator[Seq[B]])

Partitions this iterator in two iterators according to a predicate.

p: the predicate on which to partition
returns: 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.

Definition Classes: Iterator
Note: 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.

def patch[B >: Seq[B]](from: Int, patchElems: Iterator[B], replaced: Int): Iterator[B]

Returns this iterator with patched values. Patching at negative indices is the same as patching starting at 0. Patching at indices at or larger than the length of the original iterator appends the patch to the end. If more values are replaced than actually exist, the excess is ignored.

from: The start index from which to patch
patchElems: The iterator of patch values
replaced: The number of values in the original iterator that are replaced by the patch.

Definition Classes: Iterator
Note: 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.

def product: A

[use case]

Multiplies up the elements of this collection.

returns: 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.

Definition Classes: TraversableOnce → GenTraversableOnce

def reduce[A1 >: Seq[B]](op: (A1, A1) ⇒ A1): A1

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.

A1: A type parameter for the binary operator, a supertype of A.
op: A binary operator that must be associative.
returns: The result of applying reduce operator op between all the elements if the traversable or iterator is nonempty.

Definition Classes: TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this traversable or iterator is empty.

def reduceLeft[B >: Seq[B]](op: (B, Seq[B]) ⇒ B): B

Applies a binary operator to all elements of this traversable or iterator, 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.

B

the result type of the binary operator.

op

the binary operator.

returns

the result of inserting op between consecutive elements of this traversable or iterator, going left to right:

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

where x₁, ..., x_n are the elements of this traversable or iterator.

Definition Classes: TraversableOnce
Exceptions thrown: UnsupportedOperationException if this traversable or iterator is empty.

def reduceLeftOption[B >: Seq[B]](op: (B, Seq[B]) ⇒ B): Option[B]

Optionally applies a binary operator to all elements of this traversable or iterator, 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.

B: the result type of the binary operator.
op: the binary operator.
returns: an option value containing the result of reduceLeft(op) if this traversable or iterator is nonempty, None otherwise.

Definition Classes: TraversableOnce → GenTraversableOnce

def reduceOption[A1 >: Seq[B]](op: (A1, A1) ⇒ A1): Option[A1]

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.

A1: A type parameter for the binary operator, a supertype of A.
op: A binary operator that must be associative.
returns: An option value containing result of applying reduce operator op between all the elements if the collection is nonempty, and None otherwise.

Definition Classes: TraversableOnce → GenTraversableOnce

def reduceRight[B >: Seq[B]](op: (Seq[B], B) ⇒ B): B

Applies a binary operator to all elements of this traversable or iterator, 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.

B

the result type of the binary operator.

op

the binary operator.

returns

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, ..., x_n are the elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this traversable or iterator is empty.

def reduceRightOption[B >: Seq[B]](op: (Seq[B], B) ⇒ B): Option[B]

Optionally applies a binary operator to all elements of this traversable or iterator, 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.

B: the result type of the binary operator.
op: the binary operator.
returns: an option value containing the result of reduceRight(op) if this traversable or iterator is nonempty, None otherwise.

Definition Classes: TraversableOnce → GenTraversableOnce

def reversed: List[Seq[B]]

Attributes: protected[this]
Definition Classes: TraversableOnce

def sameElements(that: Iterator[_]): Boolean

Tests if another iterator produces the same values as this one.

Note: will not terminate for infinite iterators.

that: the other iterator
returns: true, if both iterators produce the same elements in the same order, false otherwise.

Definition Classes: Iterator
Note: 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.

def scanLeft[B](z: B)(op: (B, Seq[B]) ⇒ B): Iterator[B]

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

Note: will not terminate for infinite iterators.

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: iterator with intermediate results

Definition Classes: Iterator
Note: 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.

def scanRight[B](z: B)(op: (Seq[B], B) ⇒ B): Iterator[B]

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 iterators.

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: iterator with intermediate results

Definition Classes: Iterator
Note: 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.

def seq: Iterator[Seq[B]]

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

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

returns: a sequential view of the collection.

Definition Classes: Iterator → TraversableOnce → GenTraversableOnce

def size: Int

The size of this traversable or iterator.

Note: will not terminate for infinite-sized collections.

returns: the number of elements in this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def sizeHintIfCheap: Int

The size of this collection or iterator, if it can be cheaply computed

returns: the number of elements in this collection or iterator, or -1 if the size cannot be determined cheaply

Attributes: protected[collection]
Definition Classes: GenTraversableOnce

def slice(from: Int, until: Int): Iterator[Seq[B]]

Creates an iterator returning an interval of the values produced by this iterator.

from: the index of the first element in this iterator which forms part of the slice. If negative, the slice starts at zero.
until: the index of the first element following the slice. If negative, the slice is empty.
returns: an iterator which advances this iterator past the first from elements using drop, and then takes until - from elements, using take.

Definition Classes: Iterator
Note: 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.

def sliceIterator(from: Int, until: Int): Iterator[Seq[B]]

Creates an optionally bounded slice, unbounded if until is negative.

Attributes: protected
Definition Classes: Iterator

def sliding[B >: Seq[B]](size: Int, step: Int = 1): GroupedIterator[B]

Returns an iterator which presents a "sliding window" view of this iterator. The first argument is the window size, and the second argument step is how far to advance the window on each iteration. The step defaults to 1.

The default GroupedIterator can be configured to either pad a partial result to size size or suppress the partial result entirely.

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

returns: An iterator producing Seq[B]s 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. This behavior can be configured.

Definition Classes: Iterator
Note: 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.

def span(p: (Seq[B]) ⇒ Boolean): (Iterator[Seq[B]], Iterator[Seq[B]])

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

p: the test predicate
returns: a pair of Iterators consisting of the longest prefix of this whose elements all satisfy p, and the rest of the Iterator.

Definition Classes: Iterator
Note: 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.

def sum: A

[use case]

Sums up the elements of this collection.

returns: 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.

Definition Classes: TraversableOnce → GenTraversableOnce

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

Definition Classes: AnyRef

def take(n: Int): Iterator[Seq[B]]

Selects first n values of this iterator.

n: the number of values to take
returns: an iterator producing only the first n values of this iterator, or else the whole iterator, if it produces fewer than n values.

Definition Classes: Iterator
Note: 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.

def takeWhile(p: (Seq[B]) ⇒ Boolean): Iterator[Seq[B]]

Takes longest prefix of values produced by this iterator that satisfy a predicate.

p: The predicate used to test elements.
returns: An iterator returning the values produced by this iterator, until this iterator produces a value that does not satisfy the predicate p.

Definition Classes: Iterator
Note: 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.

def to[Col[_]]: Col[A]

[use case]

Converts this traversable or iterator into another by copying all elements.

Note: will not terminate for infinite iterators.

Col: The collection type to build.
returns: a new collection containing all elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def toArray: Array[A]

[use case]

Converts this traversable or iterator to an array.

Note: will not terminate for infinite iterators.

returns: an array containing all elements of this traversable or iterator. An ClassTag must be available for the element type of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def toBuffer[B >: Seq[B]]: Buffer[B]

Uses the contents of this traversable or iterator to create a new mutable buffer.

Note: will not terminate for infinite-sized collections.

returns: a buffer containing all elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def toIndexedSeq: immutable.IndexedSeq[Seq[B]]

Converts this traversable or iterator to an indexed sequence.

Note: will not terminate for infinite-sized collections.

returns: an indexed sequence containing all elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def toIterable: Iterable[Seq[B]]

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-sized collections.

returns: an Iterable containing all elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def toIterator: Iterator[Seq[B]]

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.

returns: an Iterator containing all elements of this traversable or iterator.

Definition Classes: Iterator → GenTraversableOnce

def toList: List[Seq[B]]

Converts this traversable or iterator to a list.

Note: will not terminate for infinite-sized collections.

returns: a list containing all elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def toMap[T, U]: Map[T, U]

[use case]

Converts this traversable or iterator 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 iterators.

returns: a map of type immutable.Map[T, U] containing all key/value pairs of type (T, U) of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def toParArray: ParArray[T]

Implicit: This member is added by an implicit conversion from GroupedIterator[B] to CollectionsHaveToParArray[GroupedIterator[B], T] performed by method CollectionsHaveToParArray in scala.collection.parallel. This conversion will take place only if an implicit value of type (GroupedIterator[B]) ⇒ GenTraversableOnce[T] is in scope.
Definition Classes: CollectionsHaveToParArray

def toSeq: Seq[Seq[B]]

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-sized collections.

returns: a sequence containing all elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def toSet[B >: Seq[B]]: immutable.Set[B]

Converts this traversable or iterator to a set.

Note: will not terminate for infinite-sized collections.

returns: a set containing all elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

def toStream: immutable.Stream[Seq[B]]

Converts this traversable or iterator to a stream.

returns: a stream containing all elements of this traversable or iterator.

Definition Classes: Iterator → GenTraversableOnce

def toString(): String

Converts this iterator to a string.

returns: "<iterator>" whether or not the iterator is empty.

Definition Classes: Iterator → AnyRef → Any
Note: Reuse: The iterator remains valid for further use whatever result is returned.

def toTraversable: Traversable[Seq[B]]

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.

returns: a Traversable containing all elements of this traversable or iterator.

Definition Classes: Iterator → TraversableOnce → GenTraversableOnce

def toVector: Vector[Seq[B]]

Converts this traversable or iterator to a Vector.

Note: will not terminate for infinite-sized collections.

returns: a vector containing all elements of this traversable or iterator.

Definition Classes: TraversableOnce → GenTraversableOnce

final def wait(): Unit

Definition Classes: AnyRef
Annotations: @throws( ... )

final def wait(arg0: Long, arg1: Int): Unit

Definition Classes: AnyRef
Annotations: @throws( ... )

final def wait(arg0: Long): Unit

Definition Classes: AnyRef
Annotations: @throws( ... ) @native()

def withFilter(p: (Seq[B]) ⇒ Boolean): Iterator[Seq[B]]

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.

p: the predicate used to test values.
returns: an iterator which produces those values of this iterator which satisfy the predicate p.

Definition Classes: Iterator
Note: 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.

def withPadding(x: ⇒ B): GroupedIterator.this.type

Public functions which can be used to configure the iterator before use.

Pads the last segment if necessary so that all segments will have the same size.

x: The element that will be appended to the last segment, if necessary.
returns: The same iterator, and not a new iterator.

Note: This method mutates the iterator it is called on, which can be safely used afterwards.
,
This method is mutually exclusive with withPartial(true).

def withPartial(x: Boolean): GroupedIterator.this.type

Public functions which can be used to configure the iterator before use.

Select whether the last segment may be returned with less than size elements. If not, some elements of the original iterator may not be returned at all.

x: true if partial segments may be returned, false otherwise.
returns: The same iterator, and not a new iterator.

Note: This method mutates the iterator it is called on, which can be safely used afterwards.
,
This method is mutually exclusive with withPadding.

def zip[B](that: Iterator[B]): Iterator[(Seq[B], B)]

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.

that: The iterator providing the second half of each result pair
returns: 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.

Definition Classes: Iterator
Note: 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.

def zipAll[B](that: Iterator[B], thisElem: Seq[B], thatElem: B): Iterator[(Seq[B], B)]

[use case]

Creates an iterator formed from this iterator and another iterator by combining corresponding elements in pairs. If one of the two iterators is shorter than the other, placeholder elements are used to extend the shorter iterator to the length of the longer.

that: iterator that may have a different length as the self iterator.
thisElem: element thisElem is used to fill up the resulting iterator if the self iterator is shorter than that
thatElem: element thatElem is used to fill up the resulting iterator if that is shorter than the self iterator
returns: 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.

Definition Classes: Iterator

def zipWithIndex: Iterator[(Seq[B], Int)]

Creates an iterator that pairs each element produced by this iterator with its index, counting from 0.

returns: a new iterator containing pairs consisting of corresponding elements of this iterator and their indices.

Definition Classes: Iterator
Note: 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.

def →[B](y: B): (GroupedIterator[B], B)

Implicit: This member is added by an implicit conversion from GroupedIterator[B] to ArrowAssoc[GroupedIterator[B]] performed by method ArrowAssoc in scala.Predef.
Definition Classes: ArrowAssoc

Shadowed Implicit Value Members

def filter(p: (Seq[B]) ⇒ Boolean): TraversableOnce[Seq[B]]

Implicit

This member is added by an implicit conversion from GroupedIterator[B] to MonadOps[Seq[B]] performed by method MonadOps in scala.collection.TraversableOnce.

Shadowing

This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:

(groupedIterator: MonadOps[Seq[B]]).filter(p)

Definition Classes

MonadOps

def flatMap[B](f: (Seq[B]) ⇒ GenTraversableOnce[B]): TraversableOnce[B]

Implicit

This member is added by an implicit conversion from GroupedIterator[B] to MonadOps[Seq[B]] performed by method MonadOps in scala.collection.TraversableOnce.

Shadowing

This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:

(groupedIterator: MonadOps[Seq[B]]).flatMap(f)

Definition Classes

MonadOps

def map[B](f: (Seq[B]) ⇒ B): TraversableOnce[B]

Implicit

This member is added by an implicit conversion from GroupedIterator[B] to MonadOps[Seq[B]] performed by method MonadOps in scala.collection.TraversableOnce.

Shadowing

This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:

(groupedIterator: MonadOps[Seq[B]]).map(f)

Definition Classes

MonadOps

def withFilter(p: (Seq[B]) ⇒ Boolean): Iterator[Seq[B]]

Implicit

This member is added by an implicit conversion from GroupedIterator[B] to MonadOps[Seq[B]] performed by method MonadOps in scala.collection.TraversableOnce.

Shadowing

This implicitly inherited member is shadowed by one or more members in this class.
To access this member you can use a type ascription:

(groupedIterator: MonadOps[Seq[B]]).withFilter(p)

Definition Classes

MonadOps

© 2002-2019 EPFL, with contributions from Lightbend.
Licensed under the Apache License, Version 2.0.
https://www.scala-lang.org/api/2.12.9/scala/collection/Iterator$GroupedIterator.html