object Iterator extends IterableFactory[Iterator]
- Annotations
- @SerialVersionUID()
- Source
- Iterator.scala
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- IterableFactory
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- def apply[A](xs: A*): Iterator[A]
Creates a collection with the specified elements.
Creates a collection with the specified elements.
- A
the type of the collection's elements
- returns
a new collection with elements
elems
- Definition Classes
- Iterator → IterableFactory
- def concat[A](xss: Iterable[A]*): Iterator[A]
Concatenates all argument collections into a single collection.
Concatenates all argument collections into a single collection.
- xss
the collections that are to be concatenated.
- returns
the concatenation of all the collections.
- Definition Classes
- IterableFactory
- def continually[A](elem: => A): Iterator[A]
Creates an infinite-length iterator returning the results of evaluating an expression.
Creates an infinite-length iterator returning the results of evaluating an expression. The expression is recomputed for every element.
- elem
the element computation.
- returns
the iterator containing an infinite number of results of evaluating
elem
.
- final def empty[T]: Iterator[T]
The iterator which produces no values.
The iterator which produces no values.
- Definition Classes
- Iterator → IterableFactory
- Annotations
- @inline()
- def fill[A](len: Int)(elem: => A): Iterator[A]
Creates iterator that produces the results of some element computation a number of times.
Creates iterator that produces the results of some element computation a number of times.
- len
the number of elements returned by the iterator.
- elem
the element computation
- returns
An iterator that produces the results of
n
evaluations ofelem
.
- Definition Classes
- Iterator → IterableFactory
- def fill[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(elem: => A): Iterator[Iterator[Iterator[Iterator[Iterator[A]]]]]
Produces a five-dimensional collection containing the results of some element computation a number of times.
Produces a five-dimensional collection containing the results of some element computation a number of times.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- n4
the number of elements in the 4th dimension
- n5
the number of elements in the 5th dimension
- elem
the element computation
- returns
A collection that contains the results of
n1 x n2 x n3 x n4 x n5
evaluations ofelem
.
- Definition Classes
- IterableFactory
- def fill[A](n1: Int, n2: Int, n3: Int, n4: Int)(elem: => A): Iterator[Iterator[Iterator[Iterator[A]]]]
Produces a four-dimensional collection containing the results of some element computation a number of times.
Produces a four-dimensional collection containing the results of some element computation a number of times.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- n4
the number of elements in the 4th dimension
- elem
the element computation
- returns
A collection that contains the results of
n1 x n2 x n3 x n4
evaluations ofelem
.
- Definition Classes
- IterableFactory
- def fill[A](n1: Int, n2: Int, n3: Int)(elem: => A): Iterator[Iterator[Iterator[A]]]
Produces a three-dimensional collection containing the results of some element computation a number of times.
Produces a three-dimensional collection containing the results of some element computation a number of times.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- elem
the element computation
- returns
A collection that contains the results of
n1 x n2 x n3
evaluations ofelem
.
- Definition Classes
- IterableFactory
- def fill[A](n1: Int, n2: Int)(elem: => A): Iterator[Iterator[A]]
Produces a two-dimensional collection containing the results of some element computation a number of times.
Produces a two-dimensional collection containing the results of some element computation a number of times.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- elem
the element computation
- returns
A collection that contains the results of
n1 x n2
evaluations ofelem
.
- Definition Classes
- IterableFactory
- def from(start: Int, step: Int): Iterator[Int]
Creates an infinite-length iterator returning values equally spaced apart.
Creates an infinite-length iterator returning values equally spaced apart.
- start
the start value of the iterator
- step
the increment between successive values
- returns
the iterator producing the infinite sequence of values
start, start + 1 * step, start + 2 * step, ...
- def from(start: Int): Iterator[Int]
Creates an infinite-length iterator which returns successive values from some start value.
Creates an infinite-length iterator which returns successive values from some start value.
- start
the start value of the iterator
- returns
the iterator producing the infinite sequence of values
start, start + 1, start + 2, ...
- def from[A](source: IterableOnce[A]): Iterator[A]
Creates a target collection from an existing source collection
Creates a target collection from an existing source collection
- A
the type of the collection’s elements
- source
Source collection
- returns
a new collection with the elements of
source
- Definition Classes
- Iterator → IterableFactory
- implicit def iterableFactory[A]: Factory[A, Iterator[A]]
- Definition Classes
- IterableFactory
- def iterate[T](start: T)(f: (T) => T): Iterator[T]
Creates an infinite iterator that repeatedly applies a given function to the previous result.
Creates an infinite iterator that repeatedly applies a given function to the previous result.
- start
the start value of the iterator
- f
the function that's repeatedly applied
- returns
the iterator producing the infinite sequence of values
start, f(start), f(f(start)), ...
- def iterate[A](start: A, len: Int)(f: (A) => A): Iterator[A]
Produces a collection containing repeated applications of a function to a start value.
Produces a collection containing repeated applications of a function to a start value.
- start
the start value of the collection
- len
the number of elements contained in the collection
- f
the function that's repeatedly applied
- returns
a collection with
len
values in the sequencestart, f(start), f(f(start)), ...
- Definition Classes
- IterableFactory
- def newBuilder[A]: Builder[A, Iterator[A]]
- A
the type of the collection’s elements
- returns
A builder for
Iterable
objects.
- Definition Classes
- Iterator → IterableFactory
- def range(start: Int, end: Int, step: Int): Iterator[Int]
An iterator producing equally spaced values in some integer interval.
An iterator producing equally spaced values in some integer interval.
- start
the start value of the iterator
- end
the end value of the iterator (the first value NOT returned)
- step
the increment value of the iterator (must be positive or negative)
- returns
the iterator producing values
start, start + step, ...
up to, but excludingend
- def range(start: Int, end: Int): Iterator[Int]
Creates nn iterator returning successive values in some integer interval.
Creates nn iterator returning successive values in some integer interval.
- start
the start value of the iterator
- end
the end value of the iterator (the first value NOT returned)
- returns
the iterator producing values
start, start + 1, ..., end - 1
- def range[A](start: A, end: A, step: A)(implicit arg0: Integral[A]): Iterator[A]
Produces a collection containing equally spaced values in some integer interval.
Produces a collection containing equally spaced values in some integer interval.
- start
the start value of the collection
- end
the end value of the collection (the first value NOT contained)
- step
the difference between successive elements of the collection (must be positive or negative)
- returns
a collection with values
start, start + step, ...
up to, but excludingend
- Definition Classes
- IterableFactory
- def range[A](start: A, end: A)(implicit arg0: Integral[A]): Iterator[A]
Produces a collection containing a sequence of increasing of integers.
Produces a collection containing a sequence of increasing of integers.
- start
the first element of the collection
- end
the end value of the collection (the first value NOT contained)
- returns
a collection with values
start, start + 1, ..., end - 1
- Definition Classes
- IterableFactory
- def single[A](a: A): Iterator[A]
- def tabulate[A](end: Int)(f: (Int) => A): Iterator[A]
Creates an iterator producing the values of a given function over a range of integer values starting from 0.
Creates an iterator producing the values of a given function over a range of integer values starting from 0.
- end
The number of elements returned by the iterator
- f
The function computing element values
- returns
An iterator that produces the values
f(0), ..., f(n -1)
.
- Definition Classes
- Iterator → IterableFactory
- def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(f: (Int, Int, Int, Int, Int) => A): Iterator[Iterator[Iterator[Iterator[Iterator[A]]]]]
Produces a five-dimensional collection containing values of a given function over ranges of integer values starting from 0.
Produces a five-dimensional collection containing values of a given function over ranges of integer values starting from 0.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- n4
the number of elements in the 4th dimension
- n5
the number of elements in the 5th dimension
- f
The function computing element values
- returns
A collection consisting of elements
f(i1, i2, i3, i4, i5)
for0 <= i1 < n1
,0 <= i2 < n2
,0 <= i3 < n3
,0 <= i4 < n4
, and0 <= i5 < n5
.
- Definition Classes
- IterableFactory
- def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int)(f: (Int, Int, Int, Int) => A): Iterator[Iterator[Iterator[Iterator[A]]]]
Produces a four-dimensional collection containing values of a given function over ranges of integer values starting from 0.
Produces a four-dimensional collection containing values of a given function over ranges of integer values starting from 0.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- n4
the number of elements in the 4th dimension
- f
The function computing element values
- returns
A collection consisting of elements
f(i1, i2, i3, i4)
for0 <= i1 < n1
,0 <= i2 < n2
,0 <= i3 < n3
, and0 <= i4 < n4
.
- Definition Classes
- IterableFactory
- def tabulate[A](n1: Int, n2: Int, n3: Int)(f: (Int, Int, Int) => A): Iterator[Iterator[Iterator[A]]]
Produces a three-dimensional collection containing values of a given function over ranges of integer values starting from 0.
Produces a three-dimensional collection containing values of a given function over ranges of integer values starting from 0.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- f
The function computing element values
- returns
A collection consisting of elements
f(i1, i2, i3)
for0 <= i1 < n1
,0 <= i2 < n2
, and0 <= i3 < n3
.
- Definition Classes
- IterableFactory
- def tabulate[A](n1: Int, n2: Int)(f: (Int, Int) => A): Iterator[Iterator[A]]
Produces a two-dimensional collection containing values of a given function over ranges of integer values starting from 0.
Produces a two-dimensional collection containing values of a given function over ranges of integer values starting from 0.
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- f
The function computing element values
- returns
A collection consisting of elements
f(i1, i2)
for0 <= i1 < n1
and0 <= i2 < n2
.
- Definition Classes
- IterableFactory
- def unfold[A, S](init: S)(f: (S) => Option[(A, S)]): Iterator[A]
Creates an Iterator that uses a function
f
to produce elements of typeA
and update an internal state of typeS
.Creates an Iterator that uses a function
f
to produce elements of typeA
and update an internal state of typeS
.- A
Type of the elements
- S
Type of the internal state
- init
State initial value
- f
Computes the next element (or returns
None
to signal the end of the collection)- returns
an Iterator that produces elements using
f
untilf
returnsNone
- Definition Classes
- Iterator → IterableFactory
This is the documentation for the Scala standard library.
Package structure
The scala package contains core types like
Int
,Float
,Array
orOption
which are accessible in all Scala compilation units without explicit qualification or imports.Notable packages include:
scala.collection
and its sub-packages contain Scala's collections frameworkscala.collection.immutable
- Immutable, sequential data-structures such asVector
,List
,Range
,HashMap
orHashSet
scala.collection.mutable
- Mutable, sequential data-structures such asArrayBuffer
,StringBuilder
,HashMap
orHashSet
scala.collection.concurrent
- Mutable, concurrent data-structures such asTrieMap
scala.concurrent
- Primitives for concurrent programming such asFutures
andPromises
scala.io
- Input and output operationsscala.math
- Basic math functions and additional numeric types likeBigInt
andBigDecimal
scala.sys
- Interaction with other processes and the operating systemscala.util.matching
- Regular expressionsOther packages exist. See the complete list on the right.
Additional parts of the standard library are shipped as separate libraries. These include:
scala.reflect
- Scala's reflection API (scala-reflect.jar)scala.xml
- XML parsing, manipulation, and serialization (scala-xml.jar)scala.collection.parallel
- Parallel collections (scala-parallel-collections.jar)scala.util.parsing
- Parser combinators (scala-parser-combinators.jar)scala.swing
- A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)Automatic imports
Identifiers in the scala package and the
scala.Predef
object are always in scope by default.Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example,
List
is an alias forscala.collection.immutable.List
.Other aliases refer to classes provided by the underlying platform. For example, on the JVM,
String
is an alias forjava.lang.String
.