object LazyList extends SeqFactory[LazyList]
This object provides a set of operations to create LazyList
values.
- Annotations
- @SerialVersionUID()
- Source
- LazyList.scala
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- By Inheritance
- LazyList
- SeqFactory
- IterableFactory
- Serializable
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Type Members
- final class Deferrer[A] extends AnyVal
- final class SerializationProxy[A] extends Serializable
This serialization proxy is used for LazyLists which start with a sequence of evaluated cons cells.
This serialization proxy is used for LazyLists which start with a sequence of evaluated cons cells. The forced sequence is serialized in a compact, sequential format, followed by the unevaluated tail, which uses standard Java serialization to store the complete structure of unevaluated thunks. This allows the serialization of long evaluated lazy lists without exhausting the stack through recursive serialization of cons cells.
- Annotations
- @SerialVersionUID()
Value Members
- def apply[A](elems: A*): LazyList[A]
Creates a lazy list with the specified elements.
Creates a lazy list with the specified elements.
- A
the type of the lazy list's elements
- elems
the elements of the created lazy list
- returns
a new lazy list with elements
elems
- Definition Classes
- IterableFactory
- def concat[A](xss: collection.Iterable[A]*): LazyList[A]
Concatenates all argument collections into a single lazy list.
Concatenates all argument collections into a single lazy list.
- xss
the collections that are to be concatenated.
- returns
the concatenation of all the collections.
- Definition Classes
- LazyList → IterableFactory
- def continually[A](elem: => A): LazyList[A]
Create an infinite LazyList containing the given element expression (which is computed for each occurrence).
Create an infinite LazyList containing the given element expression (which is computed for each occurrence).
- elem
the element composing the resulting LazyList
- returns
the LazyList containing an infinite number of elem
- def empty[A]: LazyList[A]
An empty collection
An empty collection
- A
the type of the lazy list's elements
- Definition Classes
- LazyList → IterableFactory
- def fill[A](n: Int)(elem: => A): LazyList[A]
Produces a lazy list containing the results of some element computation a number of times.
Produces a lazy list containing the results of some element computation a number of times.
- n
the number of elements contained in the lazy list.
- elem
the element computation
- returns
A lazy list that contains the results of
n
evaluations ofelem
.
- Definition Classes
- LazyList → IterableFactory
- def fill[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(elem: => A): LazyList[LazyList[LazyList[LazyList[LazyList[A]]]]]
Produces a five-dimensional lazy list containing the results of some element computation a number of times.
Produces a five-dimensional lazy list 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 lazy list 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): LazyList[LazyList[LazyList[LazyList[A]]]]
Produces a four-dimensional lazy list containing the results of some element computation a number of times.
Produces a four-dimensional lazy list 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 lazy list 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): LazyList[LazyList[LazyList[A]]]
Produces a three-dimensional lazy list containing the results of some element computation a number of times.
Produces a three-dimensional lazy list 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 lazy list that contains the results of
n1 x n2 x n3
evaluations ofelem
.
- Definition Classes
- IterableFactory
- def fill[A](n1: Int, n2: Int)(elem: => A): LazyList[LazyList[A]]
Produces a two-dimensional lazy list containing the results of some element computation a number of times.
Produces a two-dimensional lazy list 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 lazy list that contains the results of
n1 x n2
evaluations ofelem
.
- Definition Classes
- IterableFactory
- def from(start: Int): LazyList[Int]
Create an infinite LazyList starting at
start
and incrementing by1
.Create an infinite LazyList starting at
start
and incrementing by1
.- start
the start value of the LazyList
- returns
the LazyList starting at value
start
.
- def from(start: Int, step: Int): LazyList[Int]
Create an infinite LazyList starting at
start
and incrementing by stepstep
.Create an infinite LazyList starting at
start
and incrementing by stepstep
.- start
the start value of the LazyList
- step
the increment value of the LazyList
- returns
the LazyList starting at value
start
.
- def from[A](coll: IterableOnce[A]): LazyList[A]
Creates a target lazy list from an existing source collection
Creates a target lazy list from an existing source collection
- A
the type of the collection’s elements
- returns
a new lazy list with the elements of
source
- Definition Classes
- LazyList → IterableFactory
- implicit def iterableFactory[A]: Factory[A, LazyList[A]]
- Definition Classes
- IterableFactory
- def iterate[A](start: => A)(f: (A) => A): LazyList[A]
An infinite LazyList that repeatedly applies a given function to a start value.
An infinite LazyList that repeatedly applies a given function to a start value.
- start
the start value of the LazyList
- f
the function that's repeatedly applied
- returns
the LazyList returning the infinite sequence of values
start, f(start), f(f(start)), ...
- def iterate[A](start: A, len: Int)(f: (A) => A): LazyList[A]
Produces a lazy list containing repeated applications of a function to a start value.
Produces a lazy list containing repeated applications of a function to a start value.
- start
the start value of the lazy list
- len
the number of elements contained in the lazy list
- f
the function that's repeatedly applied
- returns
a lazy list with
len
values in the sequencestart, f(start), f(f(start)), ...
- Definition Classes
- IterableFactory
- def newBuilder[A]: Builder[A, LazyList[A]]
The builder returned by this method only evaluates elements of collections added to it as needed.
The builder returned by this method only evaluates elements of collections added to it as needed.
- A
the type of the lazy list’s elements
- returns
A builder for
LazyList
objects.
- Definition Classes
- LazyList → IterableFactory
- def range[A](start: A, end: A, step: A)(implicit arg0: Integral[A]): LazyList[A]
Produces a lazy list containing equally spaced values in some integer interval.
Produces a lazy list containing equally spaced values in some integer interval.
- start
the start value of the lazy list
- end
the end value of the lazy list (the first value NOT contained)
- step
the difference between successive elements of the lazy list (must be positive or negative)
- returns
a lazy list with values
start, start + step, ...
up to, but excludingend
- Definition Classes
- IterableFactory
- def range[A](start: A, end: A)(implicit arg0: Integral[A]): LazyList[A]
Produces a lazy list containing a sequence of increasing of integers.
Produces a lazy list containing a sequence of increasing of integers.
- start
the first element of the lazy list
- end
the end value of the lazy list (the first value NOT contained)
- returns
a lazy list with values
start, start + 1, ..., end - 1
- Definition Classes
- IterableFactory
- def tabulate[A](n: Int)(f: (Int) => A): LazyList[A]
Produces a lazy list containing values of a given function over a range of integer values starting from 0.
Produces a lazy list containing values of a given function over a range of integer values starting from 0.
- n
The number of elements in the lazy list
- f
The function computing element values
- returns
A lazy list consisting of elements
f(0), ..., f(n -1)
- Definition Classes
- LazyList → IterableFactory
- def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(f: (Int, Int, Int, Int, Int) => A): LazyList[LazyList[LazyList[LazyList[LazyList[A]]]]]
Produces a five-dimensional lazy list containing values of a given function over ranges of integer values starting from 0.
Produces a five-dimensional lazy list 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 lazy list 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): LazyList[LazyList[LazyList[LazyList[A]]]]
Produces a four-dimensional lazy list containing values of a given function over ranges of integer values starting from 0.
Produces a four-dimensional lazy list 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 lazy list 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): LazyList[LazyList[LazyList[A]]]
Produces a three-dimensional lazy list containing values of a given function over ranges of integer values starting from 0.
Produces a three-dimensional lazy list 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 lazy list 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): LazyList[LazyList[A]]
Produces a two-dimensional lazy list containing values of a given function over ranges of integer values starting from 0.
Produces a two-dimensional lazy list 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 lazy list consisting of elements
f(i1, i2)
for0 <= i1 < n1
and0 <= i2 < n2
.
- Definition Classes
- IterableFactory
- implicit def toDeferrer[A](l: => LazyList[A]): Deferrer[A]
- final def unapplySeq[A](x: LazyList[A]): UnapplySeqWrapper[A]
- Definition Classes
- SeqFactory
- def unfold[A, S](init: S)(f: (S) => Option[(A, S)]): LazyList[A]
Produces a lazy list that uses a function
f
to produce elements of typeA
and update an internal state of typeS
.Produces a lazy list 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
a lazy list that produces elements using
f
untilf
returnsNone
- Definition Classes
- LazyList → IterableFactory
- object #::
- object cons
An alternative way of building and matching lazy lists using LazyList.cons(hd, tl).
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
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,StringBuilder
,HashMap
orHashSet
scala.collection.concurrent
- Mutable, concurrent data-structures such asTrieMap
scala.concurrent
- Primitives for concurrent programming such asFutures
andPromises
scala.io
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scala.sys
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- 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
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Identifiers in the scala package and the
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