IndexedSeq

Companion object IndexedSeq

trait IndexedSeq[+A] extends Seq[A] with collection.IndexedSeq[A] with IndexedSeqOps[A, IndexedSeq, IndexedSeq[A]]

Base trait for immutable indexed sequences that have efficient apply and length

Linear Supertypes

IndexedSeqOps[A, IndexedSeq, IndexedSeq[A]], collection.IndexedSeq[A], collection.IndexedSeqOps[A, IndexedSeq, IndexedSeq[A]], Seq[A], SeqOps[A, IndexedSeq, IndexedSeq[A]], collection.Seq[A], collection.SeqOps[A, IndexedSeq, IndexedSeq[A]], Equals, ArrayLike[A], Iterable[A], collection.Iterable[A], IterableOps[A, IndexedSeq, IndexedSeq[A]], IterableOnce[A], AnyRef, Any

Known Subclasses

ImmutableArray, NumericRange, Range, Vector

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Inherited

IndexedSeq
IndexedSeqOps
IndexedSeq
IndexedSeqOps
Seq
SeqOps
Seq
SeqOps
Equals
ArrayLike
Iterable
Iterable
IterableOps
IterableOnce
AnyRef
Any

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Type Members

class WithFilter extends AnyRef
A template trait that contains just the map, flatMap, foreach and withFilter methods of trait Iterable.
A template trait that contains just the map, flatMap, foreach and withFilter methods of trait Iterable.

Definition Classes
IterableOps

Abstract Value Members

abstract def apply(i: Int): A

Definition Classes
ArrayLike
Annotations
@throws( ... )
abstract def fromSpecificIterable(coll: collection.Iterable[A]): IndexedSeq[A]

Attributes
protected[this]
Definition Classes
IterableOps
abstract def iterableFactory: IterableFactory[IndexedSeq]

Definition Classes
IterableOps
abstract def iterator(): Iterator[A]
Iterator can be used only once
Iterator can be used only once

Definition Classes
IterableOnce
abstract def length: Int

Definition Classes
ArrayLike
abstract def newSpecificBuilder(): Builder[A, IndexedSeq[A]]
returns
a strict builder for the same collection type. Note that in the case of lazy collections (e.g. View or immutable.LazyList), it is possible to implement this method but the resulting Builder will break laziness. As a consequence, operations should preferably be implemented on top of views rather than builders.

Attributes
protected[this]
Definition Classes
IterableOps

Concrete Value Members

final def !=(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def ##(): Int

Definition Classes
AnyRef → Any
final def ++[B >: A](suffix: IterableOnce[B]): IndexedSeq[B]
Alias for concat
Alias for concat

Definition Classes
IterableOps
Annotations
@inline()
final def ++:[B >: A](prefix: collection.Iterable[B]): IndexedSeq[B]
Alias for prependAll
Alias for prependAll

Definition Classes
IterableOps
Annotations
@inline()
final def +:[B >: A](elem: B): IndexedSeq[B]
Alias for prepend.
Alias for prepend.
Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

Definition Classes
SeqOps
Annotations
@inline()
final def :+[B >: A](elem: B): IndexedSeq[B]
Alias for append
Alias for append
Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

Definition Classes
SeqOps
Annotations
@inline()
final def ==(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def append[B >: A](elem: B): IndexedSeq[B]
A copy of this $coll with an element appended.
A copy of this $coll with an element appended.
B
the element type of the returned $coll.
elem
the appended element
returns
a new $coll consisting of all elements of this $coll followed by value.

Definition Classes
SeqOps
final def asInstanceOf[T0]: T0

Definition Classes
Any
def c: IndexedSeq.this.type

Attributes
protected[this]
Definition Classes
Seq → SeqOps
def canEqual(that: Any): Boolean
Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.
Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.
that
The object with which this $coll should be compared
returns
true, if this $coll can possibly equal that, false otherwise. The test takes into consideration only the run-time types of objects but ignores their elements.

Definition Classes
SeqOps → Equals
def className: String
The class name of this collection.
The class name of this collection. To be used for converting to string. Collections generally print like this:
<className>(elem_1, ..., elem_n)

Definition Classes
IterableOps
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
def coll: IndexedSeq.this.type
The collection itself
The collection itself

Attributes
protected[this]
Definition Classes
Iterable → IterableOps
def collect[B](pf: PartialFunction[A, B]): IndexedSeq[B]

Definition Classes
IterableOps
def combinations(n: Int): Iterator[IndexedSeq[A]]
Iterates over combinations.
Iterates over combinations. A _combination_ of length n is a subsequence of the original sequence, with the elements taken in order. Thus, "xy" and "yy" are both length-2 combinations of "xyy", but "yx" is not. If there is more than one way to generate the same subsequence, only one will be returned.
For example, "xyyy" has three different ways to generate "xy" depending on whether the first, second, or third "y" is selected. However, since all are identical, only one will be chosen. Which of the three will be taken is an implementation detail that is not defined.
returns
An Iterator which traverses the possible n-element combinations of this $coll.
Definition Classes
SeqOps
Example:
1. "abbbc".combinations(2) = Iterator(ab, ac, bb, bc)
def concat[B >: A](suffix: IterableOnce[B]): IndexedSeq[B]
Returns a new $coll containing the elements from the left hand operand followed by the elements from the right hand operand.
Returns a new $coll containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the $coll is the most specific superclass encompassing the element types of the two operands.
B
the element type of the returned collection.
suffix
the traversable to append.
returns
a new collection of type CC[B] which contains all elements of this $coll followed by all elements of suffix.

Definition Classes
IterableOps
def contains[A1 >: A](elem: A1): Boolean
Tests whether this $coll contains a given value as an element.
Tests whether this $coll contains a given value as an element. $mayNotTerminateInf
elem
the element to test.
returns
true if this $coll has an element that is equal (as determined by ==) to elem, false otherwise.

Definition Classes
SeqOps
def containsSlice[B](that: collection.Seq[B]): Boolean
Tests whether this $coll contains a given sequence as a slice.
Tests whether this $coll contains a given sequence as a slice. $mayNotTerminateInf
that
the sequence to test
returns
true if this $coll contains a slice with the same elements as that, otherwise false.

Definition Classes
SeqOps
def copyToArray[B >: A](xs: Array[B], start: Int = 0): xs.type
Copy all elements of this collection to array xs, starting at start.
Copy all elements of this collection to array xs, starting at start.

Definition Classes
IterableOps
def count(p: (A) ⇒ Boolean): Int
Counts the number of elements in the $coll which satisfy a predicate.
Counts the number of elements in the $coll which satisfy a predicate.
p
the predicate used to test elements.
returns
the number of elements satisfying the predicate p.

Definition Classes
IterableOps
def drop(n: Int): IndexedSeq[A]
The rest of the collection without its n first elements.
The rest of the collection without its n first elements. For linear, immutable collections this should avoid making a copy.

Definition Classes
IterableOps
def dropRight(n: Int): IndexedSeq[A]
The rest of the collection without its n last elements.
The rest of the collection without its n last elements. For linear, immutable collections this should avoid making a copy.

Definition Classes
IndexedSeqOps → IterableOps
def dropWhile(p: (A) ⇒ Boolean): IndexedSeq[A]
Skips longest sequence of elements of this iterator which satisfy given predicate p, and returns an iterator of the remaining elements.
Skips longest sequence of elements of this iterator which satisfy given predicate p, and returns an iterator of the remaining elements.
p
the predicate used to skip elements.
returns
an iterator consisting of the remaining elements

Definition Classes
IterableOps
Note
Reuse: $consumesAndProducesIterator
def endsWith[B >: A](that: collection.Seq[B]): Boolean
Tests whether this $coll ends with the given sequence.
Tests whether this $coll ends with the given sequence. $willNotTerminateInf
that
the sequence to test
returns
true if this $coll has that as a suffix, false otherwise.

Definition Classes
SeqOps
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(o: Any): Boolean

Definition Classes
SeqOps → Equals → Any
def exists(p: (A) ⇒ Boolean): Boolean
Tests whether a predicate holds for at least one element of this $coll.
Tests whether a predicate holds for at least one element of this $coll.
$mayNotTerminateInf
p
the predicate used to test elements.
returns
true if the given predicate p is satisfied by at least one element of this $coll, otherwise false

Definition Classes
IterableOps
def filter(pred: (A) ⇒ Boolean): IndexedSeq[A]
Selects all elements of this $coll which satisfy a predicate.
Selects all elements of this $coll which satisfy a predicate.
pred
the predicate used to test elements.
returns
a new $coll consisting of all elements of this $coll that satisfy the given predicate pred. Their order may not be preserved.

Definition Classes
IterableOps
def filterNot(pred: (A) ⇒ Boolean): IndexedSeq[A]
Selects all elements of this $coll which do not satisfy a predicate.
Selects all elements of this $coll which do not satisfy a predicate.
pred
the predicate used to test elements.
returns
a new $coll consisting of all elements of this $coll that do not satisfy the given predicate pred. Their order may not be preserved.

Definition Classes
IterableOps
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
def find(p: (A) ⇒ Boolean): Option[A]
Finds the first element of the $coll satisfying a predicate, if any.
Finds the first element of the $coll satisfying a predicate, if any.
$mayNotTerminateInf $orderDependent
p
the predicate used to test elements.
returns
an option value containing the first element in the $coll that satisfies p, or None if none exists.

Definition Classes
IterableOps
def flatMap[B](f: (A) ⇒ IterableOnce[B]): IndexedSeq[B]
Flatmap
Flatmap

Definition Classes
IterableOps
def flatten[B](implicit ev: (A) ⇒ IterableOnce[B]): IndexedSeq[B]

Definition Classes
IterableOps
def foldLeft[B](z: B)(op: (B, A) ⇒ B): B
Fold left
Fold left

Definition Classes
IterableOps
def foldRight[B](z: B)(op: (A, B) ⇒ B): B
Fold right
Fold right

Definition Classes
IterableOps
def forall(p: (A) ⇒ Boolean): Boolean
Tests whether a predicate holds for all elements of this $coll.
Tests whether a predicate holds for all elements of this $coll.
$mayNotTerminateInf
p
the predicate used to test elements.
returns
true if this $coll is empty or the given predicate p holds for all elements of this $coll, otherwise false.

Definition Classes
IterableOps
def foreach[U](f: (A) ⇒ U): Unit
Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.
Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.

Definition Classes
IterableOps
def fromIterable[E](it: collection.Iterable[E]): IndexedSeq[E]

Attributes
protected[this]
Definition Classes
IterableOps
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def groupBy[K](f: (A) ⇒ K): Map[K, IndexedSeq[A]]
Partitions this $coll into a map of ${coll}s according to some discriminator function.
Partitions this $coll into a map of ${coll}s according to some discriminator function.
Note: When applied to a view or a lazy collection it will always force the elements.
K
the type of keys returned by the discriminator function.
f
the discriminator function.
returns
A map from keys to ${coll}s such that the following invariant holds:
```
(xs groupBy f)(k) = xs filter (x => f(x) == k)
```
That is, every key k is bound to a $coll of those elements x for which f(x) equals k.
Definition Classes
IterableOps
def grouped(size: Int): Iterator[IndexedSeq[A]]
Partitions elements in fixed size ${coll}s.
Partitions elements in fixed size ${coll}s.
size
the number of elements per group
returns
An iterator producing ${coll}s of size size, except the last will be less than size size if the elements don't divide evenly.

Definition Classes
IterableOps
See also
scala.collection.Iterator, method grouped
def hashCode(): Int

Definition Classes
SeqOps → Any
def head: A
The first element of the collection.
The first element of the collection.

Definition Classes
IterableOps
def indexOf[B >: A](elem: B, from: Int = 0): Int
Finds index of first occurrence of some value in this $coll after or at some start index.
Finds index of first occurrence of some value in this $coll after or at some start index.
B
the type of the element elem.
elem
the element value to search for.
from
the start index
returns
the index >= from of the first element of this $coll that is equal (as determined by ==) to elem, or -1, if none exists.

Definition Classes
SeqOps
def indexOfSlice[B >: A](that: collection.Seq[B], from: Int = 0): Int
Finds first index after or at a start index where this $coll contains a given sequence as a slice.
Finds first index after or at a start index where this $coll contains a given sequence as a slice. $mayNotTerminateInf
that
the sequence to test
from
the start index
returns
the first index >= from such that the elements of this $coll starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Definition Classes
SeqOps
def indexWhere(p: (A) ⇒ Boolean, from: Int = 0): Int
Finds index of the first element satisfying some predicate after or at some start index.
Finds index of the first element satisfying some predicate after or at some start index.
$mayNotTerminateInf
p
the predicate used to test elements.
from
the start index
returns
the index >= from of the first element of this $coll that satisfies the predicate p, or -1, if none exists.

Definition Classes
SeqOps
def indices: Range
Produces the range of all indices of this sequence.
Produces the range of all indices of this sequence.
returns
a Range value from 0 to one less than the length of this $coll.

Definition Classes
SeqOps
def init: IndexedSeq[A]
The initial part of the collection without its last element.
The initial part of the collection without its last element.

Definition Classes
IterableOps
def isEmpty: Boolean
Is the collection empty?
Is the collection empty?

Definition Classes
IterableOps
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
def knownSize: Int
The number of elements in this collection, if it can be cheaply computed, -1 otherwise.
The number of elements in this collection, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.

Definition Classes
IterableOps
def last: A
Selects the last element.
Selects the last element. $orderDependent
returns
The last element of this $coll.

Definition Classes
IterableOps
Exceptions thrown
NoSuchElementException If the $coll is empty.
def lastIndexOf[B >: A](elem: B, end: Int = length - 1): Int
Finds index of last occurrence of some value in this $coll before or at a given end index.
Finds index of last occurrence of some value in this $coll before or at a given end index.
B
the type of the element elem.
elem
the element value to search for.
end
the end index.
returns
the index <= end of the last element of this $coll that is equal (as determined by ==) to elem, or -1, if none exists.

Definition Classes
SeqOps
def lastIndexOfSlice[B >: A](that: collection.Seq[B], end: Int = length - 1): Int
Finds last index before or at a given end index where this $coll contains a given sequence as a slice.
Finds last index before or at a given end index where this $coll contains a given sequence as a slice.
that
the sequence to test
end
the end index
returns
the last index <= end such that the elements of this $coll starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Definition Classes
SeqOps
def lastIndexWhere(p: (A) ⇒ Boolean, end: Int = length - 1): Int
Finds index of last element satisfying some predicate before or at given end index.
Finds index of last element satisfying some predicate before or at given end index.
p
the predicate used to test elements.
returns
the index <= end of the last element of this $coll that satisfies the predicate p, or -1, if none exists.

Definition Classes
SeqOps
def lastOption: Option[A]
Optionally selects the last element.
Optionally selects the last element. $orderDependent
returns
the last element of this $coll$ if it is nonempty, None if it is empty.

Definition Classes
IterableOps
def map[B](f: (A) ⇒ B): IndexedSeq[B]
Builds a new collection by applying a function to all elements of this $coll.
Builds a new collection by applying a function to all elements of this $coll.
B
the element type of the returned collection.
f
the function to apply to each element.
returns
a new $coll resulting from applying the given function f to each element of this $coll and collecting the results.

Definition Classes
IterableOps
def max: A
[use case] Finds the largest element.
[use case]
Finds the largest element.
returns
the largest element of this $coll.

Definition Classes
IterableOps
Full Signature
def max[B >: A](implicit ord: Ordering[B]): A
def maxBy[B](f: (A) ⇒ B): A
[use case] Finds the first element which yields the largest value measured by function f.
[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 $coll with the largest value measured by function f.

Definition Classes
IterableOps
Full Signature
def maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A
def min: A
[use case] Finds the smallest element.
[use case]
Finds the smallest element.
returns
the smallest element of this $coll

Definition Classes
IterableOps
Full Signature
def min[B >: A](implicit ord: Ordering[B]): A
def minBy[B](f: (A) ⇒ B): A
[use case] Finds the first element which yields the smallest value measured by function f.
[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 $coll with the smallest value measured by function f.

Definition Classes
IterableOps
Full Signature
def minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A
def mkString: String

Definition Classes
IterableOps
def mkString(sep: String): String

Definition Classes
IterableOps
def mkString(start: String, sep: String, end: String): String
A string showing all elements of this collection, separated by string sep.
A string showing all elements of this collection, separated by string sep.

Definition Classes
IterableOps
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def nonEmpty: Boolean
Is the collection not empty?
Is the collection not empty?

Definition Classes
IterableOps
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
def padTo[B >: A](len: Int, elem: B): IndexedSeq[B]
A copy of this $coll with an element value appended until a given target length is reached.
A copy of this $coll with an element value appended until a given target length is reached.
B
the element type of the returned $coll.
len
the target length
elem
the padding value
returns
a new collection of type $Coll consisting of all elements of this $coll followed by the minimal number of occurrences of elem so that the resulting collection has a length of at least len.

Definition Classes
SeqOps
def partition(p: (A) ⇒ Boolean): (IndexedSeq[A], IndexedSeq[A])
A pair of, first, all elements that satisfy prediacte p and, second, all elements that do not.
A pair of, first, all elements that satisfy prediacte p and, second, all elements that do not. Interesting because it splits a collection in two.
The default implementation provided here needs to traverse the collection twice. Strict collections have an overridden version of partition in Buildable, which requires only a single traversal.

Definition Classes
IterableOps
def permutations: Iterator[IndexedSeq[A]]
Iterates over distinct permutations.
Iterates over distinct permutations.
returns
An Iterator which traverses the distinct permutations of this $coll.
Definition Classes
SeqOps
Example:
1. "abb".permutations = Iterator(abb, bab, bba)
def prepend[B >: A](elem: B): IndexedSeq[B]
A copy of the $coll with an element prepended.
A copy of the $coll with an element prepended.
B
the element type of the returned $coll.
elem
the prepended element
returns
a new $coll consisting of value followed by all elements of this $coll.

Definition Classes
SeqOps
def prependAll[B](that: <error>): <error>
[use case] As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.
[use case]
As with ++, returns a new collection containing the elements from the left operand followed by the elements from the right operand.
It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.
Example:
```
scala> val x = List(1)
x: List[Int] = List(1)

scala> val y = Vector(2)
y: scala.collection.immutable.Vector[Int] = Vector(2)

scala> val z = x ++: y
z: scala.collection.immutable.Vector[Int] = Vector(1, 2)
```
B
the element type of the returned collection.
returns
a new $coll which contains all elements of prefix followed by all the elements of this $coll.

Definition Classes
IterableOps
Full Signature
def prependAll[B >: A](prefix: collection.Iterable[B]): IndexedSeq[B]
def product: A
[use case] Multiplies up the elements of this collection.
[use case]
Multiplies up the elements of this collection.
returns
the product of all elements in this $coll 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 $coll and as result type of product. Examples of such types are: Long, Float, Double, BigInt.

Definition Classes
IterableOps
Full Signature
def product[B >: A](implicit num: Numeric[B]): B
def reduce[B >: A](op: (B, B) ⇒ B): B
Reduces the elements of this $coll using the specified associative binary operator.
Reduces the elements of this $coll using the specified associative binary operator.
$undefinedorder
B
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 $coll is nonempty.

Definition Classes
IterableOps
Exceptions thrown
UnsupportedOperationException if this $coll is empty.
def reduceLeft[B >: A](op: (B, A) ⇒ B): B
Applies a binary operator to all elements of this $coll, going left to right.
Applies a binary operator to all elements of this $coll, going left to right. $willNotTerminateInf $orderDependentFold
B
the result type of the binary operator.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this $coll, 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 $coll.
Definition Classes
IterableOps
Exceptions thrown
UnsupportedOperationException if this $coll is empty.
def reduceLeftOption[B >: A](op: (B, A) ⇒ B): Option[B]
Optionally applies a binary operator to all elements of this $coll, going left to right.
Optionally applies a binary operator to all elements of this $coll, going left to right. $willNotTerminateInf $orderDependentFold
B
the result type of the binary operator.
op
the binary operator.
returns
an option value containing the result of reduceLeft(op) if this $coll is nonempty, None otherwise.

Definition Classes
IterableOps
def reduceOption[B >: A](op: (B, B) ⇒ B): Option[B]
Reduces the elements of this $coll, if any, using the specified associative binary operator.
Reduces the elements of this $coll, if any, using the specified associative binary operator.
$undefinedorder
B
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
IterableOps
def reduceRight[B >: A](op: (A, B) ⇒ B): B
Applies a binary operator to all elements of this $coll, going right to left.
Applies a binary operator to all elements of this $coll, going right to left. $willNotTerminateInf $orderDependentFold
B
the result type of the binary operator.
op
the binary operator.
returns
the result of inserting op between consecutive elements of this $coll, 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 $coll.
Definition Classes
IterableOps
Exceptions thrown
UnsupportedOperationException if this $coll is empty.
def reduceRightOption[B >: A](op: (A, B) ⇒ B): Option[B]
Optionally applies a binary operator to all elements of this $coll, going right to left.
Optionally applies a binary operator to all elements of this $coll, going right to left. $willNotTerminateInf $orderDependentFold
B
the result type of the binary operator.
op
the binary operator.
returns
an option value containing the result of reduceRight(op) if this $coll is nonempty, None otherwise.

Definition Classes
IterableOps
def reverse: IndexedSeq[A]
Returns new $coll with elements in reversed order.
Returns new $coll with elements in reversed order.
$willNotTerminateInf
returns
A new $coll with all elements of this $coll in reversed order.

Definition Classes
SeqOps
def reverseIterator(): Iterator[A]
An iterator yielding elements in reversed order.
An iterator yielding elements in reversed order.
$willNotTerminateInf
Note: xs.reverseIterator is the same as xs.reverse.iterator but might be more efficient.
returns
an iterator yielding the elements of this $coll in reversed order

Definition Classes
SeqOps
def reversed: collection.Iterable[A]

Attributes
protected[this]
Definition Classes
IndexedSeqOps → IterableOps
def sameElements[B >: A](that: IterableOnce[B]): Boolean
Are the elements of this collection the same (and in the same order) as those of that?
Are the elements of this collection the same (and in the same order) as those of that?

Definition Classes
SeqOps
def scan[B >: A](z: B)(op: (B, B) ⇒ B): IndexedSeq[B]
Computes a prefix scan of the elements of the collection.
Computes a prefix scan of the elements of the collection.
Note: The neutral element z may be applied more than once.
B
element type of the resulting collection
z
neutral element for the operator op
op
the associative operator for the scan
returns
a new $coll containing the prefix scan of the elements in this $coll

Definition Classes
IterableOps
def scanLeft[B](z: B)(op: (B, A) ⇒ B): IndexedSeq[B]
Produces a collection containing cumulative results of applying the operator going left to right.
Produces a collection containing cumulative results of applying the operator going left to right.
$willNotTerminateInf $orderDependent
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
collection with intermediate results

Definition Classes
IterableOps
def scanRight[B](z: B)(op: (A, B) ⇒ B): IndexedSeq[B]
Produces a collection containing cumulative results of applying the operator going right to left.
Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result. $willNotTerminateInf $orderDependent
Example:
```
List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
```
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
collection with intermediate results

Definition Classes
IterableOps
def seq: IndexedSeq.this.type

Attributes
protected[this]
Definition Classes
Seq → SeqOps
def size: Int
The number of elements in this collection.
The number of elements in this collection. Does not terminate for infinite collections.

Definition Classes
IterableOps
def slice(from: Int, until: Int): IndexedSeq[A]
Selects an interval of elements.
Selects an interval of elements. The returned collection is made up of all elements x which satisfy the invariant:
```
from <= indexOf(x) < until
```
$orderDependent
from
the lowest index to include from this $coll.
until
the lowest index to EXCLUDE from this $coll.
returns
a $coll containing the elements greater than or equal to index from extending up to (but not including) index until of this $coll.

Definition Classes
IterableOps
def sliding(size: Int, step: Int): Iterator[IndexedSeq[A]]
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)
size
the number of elements per group
step
the distance between the first elements of successive groups
returns
An iterator producing ${coll}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.

Definition Classes
IterableOps
See also
scala.collection.Iterator, method sliding
def sliding(size: Int): Iterator[IndexedSeq[A]]
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.) The "sliding window" step is set to one.
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.) The "sliding window" step is set to one.
size
the number of elements per group
returns
An iterator producing ${coll}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.

Definition Classes
IterableOps
See also
scala.collection.Iterator, method sliding
def sortBy[B](f: (A) ⇒ B)(implicit ord: Ordering[B]): IndexedSeq[A]
Sorts this $Coll according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.
Sorts this $Coll according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.
B
the target type of the transformation f, and the type where the ordering ord is defined.
f
the transformation function mapping elements to some other domain B.
ord
the ordering assumed on domain B.
returns
a $coll consisting of the elements of this $coll sorted according to the ordering where x < y if ord.lt(f(x), f(y)).
Definition Classes
SeqOps
Example:
1. val words = "The quick brown fox jumped over the lazy dog".split(' ') // this works because scala.Ordering will implicitly provide an Ordering[Tuple2[Int, Char]] words.sortBy(x => (x.length, x.head)) res0: Array[String] = Array(The, dog, fox, the, lazy, over, brown, quick, jumped)
See also
scala.math.Ordering $willNotTerminateInf
def sortWith(lt: (A, A) ⇒ Boolean): IndexedSeq[A]
Sorts this $coll according to a comparison function.
Sorts this $coll according to a comparison function. $willNotTerminateInf
The sort is stable. That is, elements that are equal (as determined by lt) appear in the same order in the sorted sequence as in the original.
lt
the comparison function which tests whether its first argument precedes its second argument in the desired ordering.
returns
a $coll consisting of the elements of this $coll sorted according to the comparison function lt.
Definition Classes
SeqOps
Example:
1. List("Steve", "Tom", "John", "Bob").sortWith(_.compareTo(_) < 0) = List("Bob", "John", "Steve", "Tom")
def sorted[B >: A](implicit ord: Ordering[B]): IndexedSeq[A]
Sorts this $coll according to an Ordering.
Sorts this $coll according to an Ordering.
The sort is stable. That is, elements that are equal (as determined by lt) appear in the same order in the sorted sequence as in the original.
ord
the ordering to be used to compare elements.
returns
a $coll consisting of the elements of this $coll sorted according to the ordering ord.

Definition Classes
SeqOps
See also
scala.math.Ordering
def span(p: (A) ⇒ Boolean): (IndexedSeq[A], IndexedSeq[A])
Splits this $coll into a prefix/suffix pair according to a predicate.
Splits this $coll into a prefix/suffix pair according to a predicate.
Note: c span p is equivalent to (but possibly more efficient than) (c takeWhile p, c dropWhile p), provided the evaluation of the predicate p does not cause any side-effects. $orderDependent
p
the test predicate
returns
a pair consisting of the longest prefix of this $coll whose elements all satisfy p, and the rest of this $coll.

Definition Classes
IterableOps
def splitAt(n: Int): (IndexedSeq[A], IndexedSeq[A])
Splits this $coll into two at a given position.
Splits this $coll into two at a given position. Note: c splitAt n is equivalent to (but possibly more efficient than) (c take n, c drop n). $orderDependent
n
the position at which to split.
returns
a pair of ${coll}s consisting of the first n elements of this $coll, and the other elements.

Definition Classes
IterableOps
def startsWith[B >: A](that: collection.Seq[B], offset: Int = 0): Boolean
Tests whether this $coll contains the given sequence at a given index.
Tests whether this $coll contains the given sequence at a given index.
Note: If the both the receiver object this and the argument that are infinite sequences this method may not terminate.
that
the sequence to test
offset
the index where the sequence is searched.
returns
true if the sequence that is contained in this $coll at index offset, otherwise false.

Definition Classes
SeqOps
def sum: A
[use case] Sums up the elements of this collection.
[use case]
Sums up the elements of this collection.
returns
the sum of all elements in this $coll 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 $coll and as result type of sum. Examples of such types are: Long, Float, Double, BigInt.

Definition Classes
IterableOps
Full Signature
def sum[B >: A](implicit num: Numeric[B]): B
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def tail: IndexedSeq[A]
The rest of the collection without its first element.
The rest of the collection without its first element.

Definition Classes
IterableOps
def take(n: Int): IndexedSeq[A]
A collection containing the first n elements of this collection.
A collection containing the first n elements of this collection.

Definition Classes
IterableOps
def takeRight(n: Int): IndexedSeq[A]
A collection containing the last n elements of this collection.
A collection containing the last n elements of this collection.

Definition Classes
IndexedSeqOps → IterableOps
def takeWhile(p: (A) ⇒ Boolean): IndexedSeq[A]
Takes longest prefix of elements that satisfy a predicate.
Takes longest prefix of elements that satisfy a predicate. $orderDependent
p
The predicate used to test elements.
returns
the longest prefix of this $coll whose elements all satisfy the predicate p.

Definition Classes
IterableOps
def to[C1](f: CanBuild[A, C1]): C1
Given a collection factory fi, convert this collection to the appropriate representation for the current element type A.
Given a collection factory fi, convert this collection to the appropriate representation for the current element type A. Example uses:
xs.to(List) xs.to(ArrayBuffer) xs.to(BitSet) // for xs: Iterable[Int]

Definition Classes
IterableOps
def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
Convert collection to array.
Convert collection to array.

Definition Classes
IterableOps
def toString(): String

Definition Classes
IterableOps → Any
def unzip[A1, A2](implicit asPair: <:<[A, (A1, A2)]): (IndexedSeq[A1], IndexedSeq[A2])
Converts this $coll of pairs into two collections of the first and second half of each pair.
Converts this $coll of pairs into two collections of the first and second half of each pair.
```
val xs = $Coll(
           (1, "one"),
           (2, "two"),
           (3, "three")).unzip
// xs == ($Coll(1, 2, 3),
//        $Coll(one, two, three))
```
A1
the type of the first half of the element pairs
A2
the type of the second half of the element pairs
asPair
an implicit conversion which asserts that the element type of this $coll is a pair.
returns
a pair of ${coll}s, containing the first, respectively second half of each element pair of this $coll.

Definition Classes
IterableOps
def updated[B >: A](index: Int, elem: B): IndexedSeq[B]
A copy of this $coll with one single replaced element.
A copy of this $coll with one single replaced element.
B
the element type of the returned $coll.
index
the position of the replacement
elem
the replacing element
returns
a copy of this $coll with the element at position index replaced by elem.

Definition Classes
SeqOps
Exceptions thrown
IndexOutOfBoundsException if index does not satisfy 0 <= index < length. <invalid inheritdoc annotation>
def view: IndexedView[A]
A view representing the elements of this collection.
A view representing the elements of this collection.

Definition Classes
IndexedSeqOps → IterableOps
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( ... )
def withFilter(p: (A) ⇒ Boolean): WithFilter
Creates a non-strict filter of this $coll.
Creates a non-strict filter of this $coll.
Note: the difference between c filter p and c withFilter p is that the former creates a new collection, whereas the latter only restricts the domain of subsequent map, flatMap, foreach, and withFilter operations. $orderDependent
p
the predicate used to test elements.
returns
an object of class WithFilter, which supports map, flatMap, foreach, and withFilter operations. All these operations apply to those elements of this $coll which satisfy the predicate p.

Definition Classes
IterableOps
def zip[B](xs: IterableOnce[B]): IndexedSeq[(A, B)]
Returns a $coll formed from this $coll and another iterable collection by combining corresponding elements in pairs.
Returns a $coll formed from this $coll and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.
B
the type of the second half of the returned pairs
xs
The iterable providing the second half of each result pair
returns
a new collection of type That containing pairs consisting of corresponding elements of this $coll and that. The length of the returned collection is the minimum of the lengths of this $coll and that.

Definition Classes
IterableOps
def zipWithIndex: IndexedSeq[(A, Int)]
Zips this $coll with its indices.
Zips this $coll with its indices.
returns
A new collection of type That containing pairs consisting of all elements of this $coll paired with their index. Indices start at 0.
Definition Classes
IterableOps
Example:
1. List("a", "b", "c").zipWithIndex == List(("a", 0), ("b", 1), ("c", 2))

Packages

IndexedSeq

Companion object IndexedSeq

trait IndexedSeq[+A] extends Seq[A] with collection.IndexedSeq[A] with IndexedSeqOps[A, IndexedSeq, IndexedSeq[A]]

Type Members

Abstract Value Members

Concrete Value Members

def max[B >: A](implicit ord: Ordering[B]): A

def maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

def min[B >: A](implicit ord: Ordering[B]): A

def minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

def prependAll[B >: A](prefix: collection.Iterable[B]): IndexedSeq[B]

def product[B >: A](implicit num: Numeric[B]): B

def sum[B >: A](implicit num: Numeric[B]): B

Inherited from IndexedSeqOps[A, IndexedSeq, IndexedSeq[A]]

Inherited from collection.IndexedSeq[A]

Inherited from collection.IndexedSeqOps[A, IndexedSeq, IndexedSeq[A]]

Inherited from Seq[A]

Inherited from SeqOps[A, IndexedSeq, IndexedSeq[A]]

Inherited from collection.Seq[A]

Inherited from collection.SeqOps[A, IndexedSeq, IndexedSeq[A]]

Inherited from Equals

Inherited from ArrayLike[A]

Inherited from Iterable[A]

Inherited from collection.Iterable[A]

Inherited from IterableOps[A, IndexedSeq, IndexedSeq[A]]

Inherited from IterableOnce[A]

Inherited from AnyRef

Inherited from Any

Ungrouped

Packages

IndexedSeq 

Companion object IndexedSeq

trait IndexedSeq[+A] extends Seq[A] with collection.IndexedSeq[A] with IndexedSeqOps[A, IndexedSeq, IndexedSeq[A]]

Type Members

Abstract Value Members

Concrete Value Members

def max[B >: A](implicit ord: Ordering[B]): A

def maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

def min[B >: A](implicit ord: Ordering[B]): A

def minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

def prependAll[B >: A](prefix: collection.Iterable[B]): IndexedSeq[B]

def product[B >: A](implicit num: Numeric[B]): B

def sum[B >: A](implicit num: Numeric[B]): B

Inherited from IndexedSeqOps[A, IndexedSeq, IndexedSeq[A]]

Inherited from collection.IndexedSeq[A]

Inherited from collection.IndexedSeqOps[A, IndexedSeq, IndexedSeq[A]]

Inherited from Seq[A]

Inherited from SeqOps[A, IndexedSeq, IndexedSeq[A]]

Inherited from collection.Seq[A]

Inherited from collection.SeqOps[A, IndexedSeq, IndexedSeq[A]]

Inherited from Equals

Inherited from ArrayLike[A]

Inherited from Iterable[A]

Inherited from collection.Iterable[A]

Inherited from IterableOps[A, IndexedSeq, IndexedSeq[A]]

Inherited from IterableOnce[A]

Inherited from AnyRef

Inherited from Any

Ungrouped

IndexedSeq