Object scala.collection.Seq
Companion trait Seq
object Seq extends SeqFactory[Seq]
Type Members
type Coll = Seq[_]
The underlying collection type with unknown element type
- Attributes
- protected[this]
- Definition Classes
- GenericCompanion
class GenericCanBuildFrom[A] extends CanBuildFrom[CC[_], A, CC[A]]
A generic implementation of the CanBuildFrom
trait, which forwards all calls to apply(from)
to the genericBuilder
method of collection from
, and which forwards all calls of apply()
to the newBuilder
method of this factory.
- Definition Classes
- GenTraversableFactory
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
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 ReusableCBF: GenericCanBuildFrom[Nothing]
- Definition Classes
- GenTraversableFactory
def apply[A](elems: A*): Seq[A]
Creates a collection with the specified elements.
- A
the type of the collection's elements
- elems
the elements of the created collection
- returns
a new collection with elements
elems
- Definition Classes
- GenericCompanion
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 typeT0
.
implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, Seq[A]]
The standard CanBuildFrom
instance for Seq
objects. The created value is an instance of class GenericCanBuildFrom
, which forwards calls to create a new builder to the genericBuilder
method of the requesting collection.
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.
def concat[A](xss: Traversable[A]*): Seq[A]
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
- GenTraversableFactory
def empty[A]: Seq[A]
An empty collection of type CC
[A]
- A
the type of the collection's elements
- Definition Classes
- GenericCompanion
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:
-
It is consistent: for any non-null instances
x
and y
of type AnyRef
, multiple invocations of x.eq(y)
consistently returns true
or consistently returns false
.For any non-null instance x
of type AnyRef
, x.eq(null)
and null.eq(x)
returns false
.
null.eq(null)
returns true
. When overriding the equals
or hashCode
methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2
), they should be equal to each other (o1 == o2
) and they should hash to the same value (o1.hashCode == o2.hashCode
).
- 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
.
See also equals
in scala.Any.
- returns
true
if the receiver object is equivalent to the argument;false
otherwise.
- Definition Classes
- AnyRef → Any
def fill[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(elem: ⇒ A): Seq[Seq[Seq[Seq[Seq[A]]]]]
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 3nd 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
- GenTraversableFactory
def fill[A](n1: Int, n2: Int, n3: Int, n4: Int)(elem: ⇒ A): Seq[Seq[Seq[Seq[A]]]]
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 3nd 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
- GenTraversableFactory
def fill[A](n1: Int, n2: Int, n3: Int)(elem: ⇒ A): Seq[Seq[Seq[A]]]
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 3nd dimension
- elem
the element computation
- returns
A collection that contains the results of
n1 x n2 x n3
evaluations ofelem
.
- Definition Classes
- GenTraversableFactory
def fill[A](n1: Int, n2: Int)(elem: ⇒ A): Seq[Seq[A]]
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
- GenTraversableFactory
def fill[A](n: Int)(elem: ⇒ A): Seq[A]
Produces a collection containing the results of some element computation a number of times.
- n
the number of elements contained in the collection.
- elem
the element computation
- returns
A collection that contains the results of
n
evaluations ofelem
.
- Definition Classes
- GenTraversableFactory
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
final def getClass(): Class[_]
Returns the runtime class representation of the object.
- returns
a class object corresponding to the runtime type of the receiver.
def hashCode(): Int
The hashCode method for reference types. See hashCode in scala.Any.
- returns
the hash code value for this object.
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 typeT0
;false
otherwise.
- Definition Classes
- Any
def iterate[A](start: A, len: Int)(f: (A) ⇒ A): Seq[A]
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
- GenTraversableFactory
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 newBuilder[A]: Builder[A, Seq[A]]
The default builder for
objects.Seq
- A
the type of the sequence's elements
- Definition Classes
- Seq → GenericCompanion
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 range[T](start: T, end: T, step: T)(implicit arg0: Integral[T]): Seq[T]
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
- GenTraversableFactory
def range[T](start: T, end: T)(implicit arg0: Integral[T]): Seq[T]
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
- GenTraversableFactory
final def synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(f: (Int, Int, Int, Int, Int) ⇒ A): Seq[Seq[Seq[Seq[Seq[A]]]]]
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 3nd 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
- GenTraversableFactory
def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int)(f: (Int, Int, Int, Int) ⇒ A): Seq[Seq[Seq[Seq[A]]]]
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 3nd 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
- GenTraversableFactory
def tabulate[A](n1: Int, n2: Int, n3: Int)(f: (Int, Int, Int) ⇒ A): Seq[Seq[Seq[A]]]
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 3nd 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
- GenTraversableFactory
def tabulate[A](n1: Int, n2: Int)(f: (Int, Int) ⇒ A): Seq[Seq[A]]
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
- GenTraversableFactory
def tabulate[A](n: Int)(f: (Int) ⇒ A): Seq[A]
Produces a collection containing values of a given function over a range of integer values starting from 0.
- n
The number of elements in the collection
- f
The function computing element values
- returns
A collection consisting of elements
f(0), ..., f(n -1)
- Definition Classes
- GenTraversableFactory
def toString(): String
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
- returns
a String representation of the object.
- Definition Classes
- AnyRef → Any
def unapplySeq[A](x: Seq[A]): Some[Seq[A]]
This method is called in a pattern match { case Seq(...) => }.
- x
the selector value
- returns
sequence wrapped in an option, if this is a Seq, otherwise none
- Definition Classes
- SeqFactory
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
© 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/Seq$.html
This object provides a set of operations to create
values. The current default implementation of aSeq
Seq
is aList
.