Class scala.collection.mutable.ArrayOps.ofUnit

final class ofUnit extends AnyVal with ArrayOps[Unit] with ArrayLike[Unit, Array[Unit]]

A subclass of ArrayOps for arrays of Unit types.

Source: ArrayOps.scala

Linear Supertypes

Instance Constructors

new ofUnit(repr: Array[Unit])

Type Members

class Elements extends AbstractIterator[A] with BufferedIterator[A] with Serializable

The class of the iterator returned by the iterator method. multiple take, drop, and slice operations on this iterator are bunched together for better efficiency.

Attributes: protected
Definition Classes: IndexedSeqLike
Annotations: @SerialVersionUID()

class WithFilter extends FilterMonadic[A, Repr]

A class supporting filtered operations. Instances of this class are returned by method withFilter.

Definition Classes: TraversableLike

type Self = Array[Unit]

The type implementing this traversable

Attributes: protected[this]
Definition Classes: TraversableLike

Value Members

final def !=(arg0: Any): Boolean

Test two objects for inequality.

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

Definition Classes: 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: Any

def +(other: String): String

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

def ++[B >: Unit, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Array[Unit], B, That]): That

Returns a new traversable collection containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the traversable collection is the most specific superclass encompassing the element types of the two operands.

B: the element type of the returned collection.
That: the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type B being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, B, That] is found.
that: the traversable to append.
bf: an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.
returns: a new collection of type That which contains all elements of this traversable collection followed by all elements of that.

Definition Classes: TraversableLike → GenTraversableLike

def ++:[B >: Unit, That](that: collection.Traversable[B])(implicit bf: CanBuildFrom[Array[Unit], B, That]): That

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 = LinkedList(2)
y: scala.collection.mutable.LinkedList[Int] = LinkedList(2)

scala> val z = x ++: y
z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)

This overload exists because: for the implementation of ++: we should reuse that of ++ because many collections override it with more efficient versions.

Since TraversableOnce has no ++ method, we have to implement that directly, but Traversable and down can use the overload.

B: the element type of the returned collection.
That: the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type B being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, B, That] is found.
that: the traversable to append.
bf: an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.
returns: a new collection of type That which contains all elements of this traversable collection followed by all elements of that.

Definition Classes: TraversableLike

def ++:[B](that: TraversableOnce[B]): Array[B]

[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 = LinkedList(2)
y: scala.collection.mutable.LinkedList[Int] = LinkedList(2)

scala> val z = x ++: y
z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)

B: the element type of the returned collection.
that: the traversable to append.
returns: a new mutable indexed sequence which contains all elements of this mutable indexed sequence followed by all elements of that.

Definition Classes: TraversableLike

def +:[B >: Unit](elem: B)(implicit arg0: ClassTag[B]): Array[B]

Definition Classes: ArrayOps

def +:(elem: A): Array[A]

[use case]

A copy of the mutable indexed sequence with an element prepended.

Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

Also, the original mutable indexed sequence is not modified, so you will want to capture the result.

Example:

scala> val x = List(1)
x: List[Int] = List(1)

scala> val y = 2 +: x
y: List[Int] = List(2, 1)

scala> println(x)
List(1)

elem: the prepended element
returns: a new mutable indexed sequence consisting of elem followed by all elements of this mutable indexed sequence.

Definition Classes: SeqLike → GenSeqLike

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

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

def /:[B](z: B)(op: (B, Unit) ⇒ 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 >: Unit](elem: B)(implicit arg0: ClassTag[B]): Array[B]

Definition Classes: ArrayOps

def :+(elem: A): Array[A]

[use case]

A copy of this mutable indexed sequence with an element appended.

A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

Example:

scala> val a = List(1)
a: List[Int] = List(1)

scala> val b = a :+ 2
b: List[Int] = List(1, 2)

scala> println(a)
List(1)

elem: the appended element
returns: a new mutable indexed sequence consisting of all elements of this mutable indexed sequence followed by elem.

Definition Classes: SeqLike → GenSeqLike

def :\[B](z: B)(op: (Unit, 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

Test two objects for equality. 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: Any

def addString(b: scala.StringBuilder): scala.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: scala.StringBuilder, sep: String): scala.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: scala.StringBuilder, start: String, sep: String, end: String): scala.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, Unit) ⇒ 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

def apply(index: Int): Unit

Selects an element by its index in the mutable indexed sequence.

Example:

scala> val x = List(1, 2, 3, 4, 5)
x: List[Int] = List(1, 2, 3, 4, 5)

scala> x(3)
res1: Int = 4

returns: the element of this mutable indexed sequence at index idx, where 0 indicates the first element.

Definition Classes: ofUnit → SeqLike → GenSeqLike
Exceptions thrown: IndexOutOfBoundsException if idx does not satisfy 0 <= idx < length.

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 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.

that: The object with which this iterable collection should be compared
returns: true, if this iterable collection can possibly equal that, false otherwise. The test takes into consideration only the run-time types of objects but ignores their elements.

Definition Classes: IterableLike → Equals

def collect[B](pf: PartialFunction[A, B]): Array[B]

[use case]

Builds a new collection by applying a partial function to all elements of this mutable indexed sequence on which the function is defined.

B: the element type of the returned collection.
pf: the partial function which filters and maps the mutable indexed sequence.
returns: a new mutable indexed sequence resulting from applying the given partial function pf to each element on which it is defined and collecting the results. The order of the elements is preserved.

Definition Classes: TraversableLike → GenTraversableLike

def collectFirst[B](pf: PartialFunction[Unit, 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 combinations(n: Int): Iterator[Array[Unit]]

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 sequence.

Definition Classes: SeqLike

def contains[A1 >: Unit](elem: A1): Boolean

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

Note: may not terminate for infinite-sized collections.

elem: the element to test.
returns: true if this sequence has an element that is equal (as determined by ==) to elem, false otherwise.

Definition Classes: SeqLike

def containsSlice[B](that: GenSeq[B]): Boolean

Tests whether this sequence contains a given sequence as a slice.

Note: may not terminate for infinite-sized collections.

that: the sequence to test
returns: true if this sequence contains a slice with the same elements as that, otherwise false.

Definition Classes: SeqLike

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

[use case]

Copies the elements of this mutable indexed sequence to an array. Fills the given array xs with at most len elements of this mutable indexed sequence, starting at position start. Copying will stop once either the end of the current mutable indexed sequence is reached, or the end of the target array is reached, or len elements have been copied.

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

Definition Classes: ArrayOps → IndexedSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

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

[use case]

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

xs: the array to fill.

Definition Classes: TraversableOnce → GenTraversableOnce

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

[use case]

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

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

Definition Classes: TraversableOnce → GenTraversableOnce

def copyToBuffer[B >: Unit](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: GenSeq[B])(p: (Unit, B) ⇒ Boolean): Boolean

Tests whether every element of this sequence relates to the corresponding element of another sequence by satisfying a test predicate.

B: the type of the elements of that
that: the other sequence
p: the test predicate, which relates elements from both sequences
returns: true if both sequences have the same length and p(x, y) is true for all corresponding elements x of this sequence and y of that, otherwise false.

Definition Classes: SeqLike → GenSeqLike

def count(p: (Unit) ⇒ 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 deep: collection.IndexedSeq[Any]

Creates a possible nested IndexedSeq which consists of all the elements of this array. If the elements are arrays themselves, the deep transformation is applied recursively to them. The stringPrefix of the IndexedSeq is "Array", hence the IndexedSeq prints like an array with all its elements shown, and the same recursively for any subarrays.

Example:

Array(Array(1, 2), Array(3, 4)).deep.toString

prints: Array(Array(1, 2), Array(3, 4))

returns: An possibly nested indexed sequence of consisting of all the elements of the array.

Definition Classes: ArrayLike

def diff(that: collection.Seq[Unit]): Array[Unit]

[use case]

Computes the multiset difference between this mutable indexed sequence and another sequence.

that: the sequence of elements to remove
returns: a new mutable indexed sequence which contains all elements of this mutable indexed sequence except some of occurrences of elements that also appear in that. If an element value x appears n times in that, then the first n occurrences of x will not form part of the result, but any following occurrences will.

Definition Classes: SeqLike → GenSeqLike

def distinct: Array[Unit]

Builds a new sequence from this sequence without any duplicate elements.

Note: will not terminate for infinite-sized collections.

returns: A new sequence which contains the first occurrence of every element of this sequence.

Definition Classes: SeqLike → GenSeqLike

def drop(n: Int): Array[Unit]

Selects all elements except first n ones.

n: the number of elements to drop from this sequence.
returns: a sequence consisting of all elements of this sequence except the first n ones, or else the empty sequence, if this sequence has less than n elements. If n is negative, don't drop any elements.

Definition Classes: IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike

def dropRight(n: Int): Array[Unit]

Selects all elements except last n ones.

n: The number of elements to take
returns: a sequence consisting of all elements of this sequence except the last n ones, or else the empty sequence, if this sequence has less than n elements.

Definition Classes: IndexedSeqOptimized → IterableLike

def dropWhile(p: (Unit) ⇒ Boolean): Array[Unit]

Drops longest prefix of elements that satisfy a predicate.

returns: the longest suffix of this sequence whose first element does not satisfy the predicate p.

Definition Classes: IndexedSeqOptimized → TraversableLike → GenTraversableLike

def endsWith[B](that: GenSeq[B]): Boolean

Tests whether this sequence ends with the given sequence.

that: the sequence to test
returns: true if this sequence has that as a suffix, false otherwise.

Definition Classes: IndexedSeqOptimized → SeqLike → GenSeqLike

def ensuring(cond: (ofUnit) ⇒ Boolean, msg: ⇒ Any): ofUnit

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

def ensuring(cond: (ofUnit) ⇒ Boolean): ofUnit

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

def ensuring(cond: Boolean, msg: ⇒ Any): ofUnit

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

def ensuring(cond: Boolean): ofUnit

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

def exists(p: (Unit) ⇒ Boolean): Boolean

Tests whether a predicate holds for at least one element of this sequence.

p: the predicate used to test elements.
returns: false if this sequence is empty, otherwise true if the given predicate p holds for some of the elements of this sequence, otherwise false

Definition Classes: IndexedSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

def filter(p: (Unit) ⇒ Boolean): Array[Unit]

Selects all elements of this traversable collection which satisfy a predicate.

p: the predicate used to test elements.
returns: a new traversable collection consisting of all elements of this traversable collection that satisfy the given predicate p. The order of the elements is preserved.

Definition Classes: TraversableLike → GenTraversableLike

def filterNot(p: (Unit) ⇒ Boolean): Array[Unit]

Selects all elements of this traversable collection which do not satisfy a predicate.

p: the predicate used to test elements.
returns: a new traversable collection consisting of all elements of this traversable collection that do not satisfy the given predicate p. The order of the elements is preserved.

Definition Classes: TraversableLike → GenTraversableLike

def find(p: (Unit) ⇒ Boolean): Option[Unit]

Finds the first element of the sequence satisfying a predicate, if any.

p: the predicate used to test elements.
returns: an option value containing the first element in the sequence that satisfies p, or None if none exists.

Definition Classes: IndexedSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): Array[B]

[use case]

Builds a new collection by applying a function to all elements of this mutable indexed sequence and using the elements of the resulting collections.

For example:

def getWords(lines: Seq[String]): Seq[String] = lines flatMap (line => line split "\\W+")

The type of the resulting collection is guided by the static type of mutable indexed sequence. This might cause unexpected results sometimes. For example:

// lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)

// lettersOf will return a Set[Char], not a Seq
def lettersOf(words: Seq[String]) = words.toSet flatMap (word => word.toSeq)

// xs will be an Iterable[Int]
val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2)

// ys will be a Map[Int, Int]
val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)

B: the element type of the returned collection.
f: the function to apply to each element.
returns: a new mutable indexed sequence resulting from applying the given collection-valued function f to each element of this mutable indexed sequence and concatenating the results.

Definition Classes: TraversableLike → GenTraversableLike → FilterMonadic

def flatten[U](implicit asTrav: (Unit) ⇒ collection.Traversable[U], m: ClassTag[U]): Array[U]

Flattens a two-dimensional array by concatenating all its rows into a single array.

U: Type of row elements.
asTrav: A function that converts elements of this array to rows - arrays of type U.
returns: An array obtained by concatenating rows of this array.

Definition Classes: ArrayOps

def fold[A1 >: Unit](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, Unit) ⇒ B): B

Applies a binary operator to a start value and all elements of this sequence, going left to right.

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 sequence, 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 sequence. Returns z if this sequence is empty.

Definition Classes: IndexedSeqOptimized → TraversableOnce → GenTraversableOnce

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

Applies a binary operator to all elements of this sequence and a start value, going right to left.

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 sequence, 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 sequence. Returns z if this sequence is empty.

Definition Classes: IndexedSeqOptimized → IterableLike → TraversableOnce → GenTraversableOnce

def forall(p: (Unit) ⇒ Boolean): Boolean

Tests whether a predicate holds for all elements of this sequence.

p: the predicate used to test elements.
returns: true if this sequence is empty or the given predicate p holds for all elements of this sequence, otherwise false.

Definition Classes: IndexedSeqOptimized → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

def foreach(f: (A) ⇒ Unit): Unit

[use case]

Applies a function f to all elements of this mutable indexed sequence.

Note: this method underlies the implementation of most other bulk operations. Subclasses should re-implement this method if a more efficient implementation exists.

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

Definition Classes: IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic

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 ofUnit to StringFormat[ofUnit] performed by method StringFormat in scala.Predef.
Definition Classes: StringFormat
Annotations: @inline()

def getClass(): Class[_ <: AnyVal]

Returns the runtime class representation of the object.

returns: a class object corresponding to the runtime type of the receiver.

Definition Classes: AnyVal → Any

def groupBy[K](f: (Unit) ⇒ K): immutable.Map[K, Array[Unit]]

Partitions this traversable collection into a map of traversable collections according to some discriminator function.

Note: this method is not re-implemented by views. This means when applied to a view it will always force the view and return a new traversable collection.

K

the type of keys returned by the discriminator function.

f

the discriminator function.

returns

A map from keys to traversable collections 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 traversable collection of those elements x for which f(x) equals k.

Definition Classes: TraversableLike → GenTraversableLike

def grouped(size: Int): Iterator[Array[Unit]]

Partitions elements in fixed size iterable collections.

size: the number of elements per group
returns: An iterator producing iterable collections of size size, except the last will be less than size size if the elements don't divide evenly.

Definition Classes: IterableLike
See also: scala.collection.Iterator, method grouped

def hasDefiniteSize: Boolean

Tests whether this traversable collection is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as Stream, the predicate returns true if all elements have been computed. It returns false if the stream is not yet evaluated to the end. Non-empty Iterators usually return false even if they were created from a collection with a known finite size.

Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that hasDefiniteSize returns true. However, checking hasDefiniteSize can provide an assurance that size is well-defined and non-termination is not a concern.

returns: true if this collection is known to have finite size, false otherwise.

Definition Classes: TraversableLike → TraversableOnce → GenTraversableOnce

def head: Unit

Selects the first element of this sequence.

returns: the first element of this sequence.

Definition Classes: IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike
Exceptions thrown: NoSuchElementException if the sequence is empty.

def headOption: Option[Unit]

Optionally selects the first element.

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

returns: the first element of this traversable collection if it is nonempty, None if it is empty.

Definition Classes: TraversableLike → GenTraversableLike

def indexOf(elem: Unit, from: Int): Int

[use case]

Finds index of first occurrence of some value in this mutable indexed sequence after or at some start index.

elem: the element value to search for.
from: the start index
returns: the index >= from of the first element of this mutable indexed sequence that is equal (as determined by ==) to elem, or -1, if none exists.

Definition Classes: GenSeqLike

def indexOf(elem: Unit): Int

[use case]

Finds index of first occurrence of some value in this mutable indexed sequence.

elem: the element value to search for.
returns: the index of the first element of this mutable indexed sequence that is equal (as determined by ==) to elem, or -1, if none exists.

Definition Classes: GenSeqLike

def indexOfSlice[B >: Unit](that: GenSeq[B], from: Int): Int

Finds first index after or at a start index where this sequence contains a given sequence as a slice.

Note: may not terminate for infinite-sized collections.

that: the sequence to test
from: the start index
returns: the first index >= from such that the elements of this sequence starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Definition Classes: SeqLike

def indexOfSlice[B >: Unit](that: GenSeq[B]): Int

Finds first index where this sequence contains a given sequence as a slice.

Note: may not terminate for infinite-sized collections.

that: the sequence to test
returns: the first index such that the elements of this sequence starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Definition Classes: SeqLike

def indexWhere(p: (Unit) ⇒ Boolean, from: Int): Int

Finds index of the first element satisfying some predicate after or at some start index.

p: the predicate used to test elements.
from: the start index
returns: the index >= from of the first element of this sequence that satisfies the predicate p, or -1, if none exists.

Definition Classes: IndexedSeqOptimized → SeqLike → GenSeqLike

def indexWhere(p: (Unit) ⇒ Boolean): Int

Finds index of first element satisfying some predicate.

Note: may not terminate for infinite-sized collections.

p: the predicate used to test elements.
returns: the index of the first element of this general sequence that satisfies the predicate p, or -1, if none exists.

Definition Classes: GenSeqLike

def indices: immutable.Range

Produces the range of all indices of this sequence.

returns: a Range value from 0 to one less than the length of this sequence.

Definition Classes: SeqLike

def init: Array[Unit]

Selects all elements except the last.

returns: a sequence consisting of all elements of this sequence except the last one.

Definition Classes: IndexedSeqOptimized → TraversableLike → GenTraversableLike
Exceptions thrown: UnsupportedOperationException if the sequence is empty.

def inits: Iterator[Array[Unit]]

Iterates over the inits of this traversable collection. The first value will be this traversable collection and the final one will be an empty traversable collection, with the intervening values the results of successive applications of init.

returns: an iterator over all the inits of this traversable collection

Definition Classes: TraversableLike

def intersect(that: collection.Seq[Unit]): Array[Unit]

[use case]

Computes the multiset intersection between this mutable indexed sequence and another sequence.

that: the sequence of elements to intersect with.
returns: a new mutable indexed sequence which contains all elements of this mutable indexed sequence which also appear in that. If an element value x appears n times in that, then the first n occurrences of x will be retained in the result, but any following occurrences will be omitted.

Definition Classes: SeqLike → GenSeqLike

def isDefinedAt(idx: Int): Boolean

Tests whether this general sequence contains given index.

The implementations of methods apply and isDefinedAt turn a Seq[A] into a PartialFunction[Int, A].

idx: the index to test
returns: true if this general sequence contains an element at position idx, false otherwise.

Definition Classes: GenSeqLike

def isEmpty: Boolean

Tests whether this sequence is empty.

returns: true if the sequence contain no elements, false otherwise.

Definition Classes: IndexedSeqOptimized → SeqLike → IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce

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

final def isTraversableAgain: Boolean

Tests whether this traversable collection can be repeatedly traversed.

returns: true

Definition Classes: TraversableLike → GenTraversableLike → GenTraversableOnce

def iterator: Iterator[Unit]

Creates a new iterator over all elements contained in this iterable object.

returns: the new iterator

Definition Classes: IndexedSeqLike → IterableLike → GenIterableLike

def last: Unit

Selects the last element.

returns: The last element of this sequence.

Definition Classes: IndexedSeqOptimized → TraversableLike → GenTraversableLike
Exceptions thrown: NoSuchElementException If the sequence is empty.

def lastIndexOf(elem: Unit, end: Int): Int

[use case]

Finds index of last occurrence of some value in this mutable indexed sequence before or at a given end index.

elem: the element value to search for.
end: the end index.
returns: the index <= end of the last element of this mutable indexed sequence that is equal (as determined by ==) to elem, or -1, if none exists.

Definition Classes: GenSeqLike

def lastIndexOf(elem: Unit): Int

[use case]

Finds index of last occurrence of some value in this mutable indexed sequence.

elem: the element value to search for.
returns: the index of the last element of this mutable indexed sequence that is equal (as determined by ==) to elem, or -1, if none exists.

Definition Classes: GenSeqLike

def lastIndexOfSlice[B >: Unit](that: GenSeq[B], end: Int): Int

Finds last index before or at a given end index where this sequence 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 sequence starting at this index match the elements of sequence that, or -1 of no such subsequence exists.

Definition Classes: SeqLike

def lastIndexOfSlice[B >: Unit](that: GenSeq[B]): Int

Finds last index where this sequence contains a given sequence as a slice.

Note: will not terminate for infinite-sized collections.

that: the sequence to test
returns: the last index such that the elements of this sequence starting a this index match the elements of sequence that, or -1 of no such subsequence exists.

Definition Classes: SeqLike

def lastIndexWhere(p: (Unit) ⇒ Boolean, end: Int): Int

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 sequence that satisfies the predicate p, or -1, if none exists.

Definition Classes: IndexedSeqOptimized → SeqLike → GenSeqLike

def lastIndexWhere(p: (Unit) ⇒ Boolean): Int

Finds index of last element satisfying some predicate.

Note: will not terminate for infinite-sized collections.

p: the predicate used to test elements.
returns: the index of the last element of this general sequence that satisfies the predicate p, or -1, if none exists.

Definition Classes: GenSeqLike

def lastOption: Option[Unit]

Optionally selects the last element.

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

returns: the last element of this traversable collection$ if it is nonempty, None if it is empty.

Definition Classes: TraversableLike → GenTraversableLike

def length: Int

The length of the mutable indexed sequence.

Note: xs.length and xs.size yield the same result.

returns: the number of elements in this mutable indexed sequence.

Definition Classes: ofUnit → SeqLike → GenSeqLike
Exceptions thrown: IllegalArgumentException if the length of the sequence cannot be represented in an Int, for example, (-1 to Int.MaxValue).length.

def lengthCompare(len: Int): Int

Compares the length of this sequence to a test value.

len

the test value that gets compared with the length.

returns

A value x where

x <  0       if this.length <  len
x == 0       if this.length == len
x >  0       if this.length >  len

The method as implemented here does not call length directly; its running time is O(length min len) instead of O(length). The method should be overwritten if computing length is cheap.

Definition Classes: IndexedSeqOptimized → SeqLike

def map[B](f: (A) ⇒ B): Array[B]

[use case]

Builds a new collection by applying a function to all elements of this mutable indexed sequence.

B: the element type of the returned collection.
f: the function to apply to each element.
returns: a new mutable indexed sequence resulting from applying the given function f to each element of this mutable indexed sequence and collecting the results.

Definition Classes: TraversableLike → GenTraversableLike → FilterMonadic

def max: A

[use case]

Finds the largest element.

returns: the largest element of this mutable indexed sequence.

Definition Classes: TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this mutable indexed sequence 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 mutable indexed sequence with the largest value measured by function f.

Definition Classes: TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this mutable indexed sequence is empty.

def min: A

[use case]

Finds the smallest element.

returns: the smallest element of this mutable indexed sequence

Definition Classes: TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this mutable indexed sequence 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 mutable indexed sequence with the smallest value measured by function f.

Definition Classes: TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this mutable indexed sequence 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

def newBuilder: ArrayBuilder.ofUnit

Creates a new builder for this collection type.

Attributes: protected[this]
Definition Classes: ofUnit → TraversableLike → HasNewBuilder

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

def padTo(len: Int, elem: A): Array[A]

[use case]

A copy of this mutable indexed sequence with an element value appended until a given target length is reached.

len: the target length
elem: the padding value
returns: a new mutable indexed sequence consisting of all elements of this mutable indexed sequence followed by the minimal number of occurrences of elem so that the resulting mutable indexed sequence has a length of at least len.

Definition Classes: SeqLike → GenSeqLike

def par: ParArray[Unit]

Returns a parallel implementation of this collection.

For most collection types, this method creates a new parallel collection by copying all the elements. For these collection, par takes linear time. Mutable collections in this category do not produce a mutable parallel collection that has the same underlying dataset, so changes in one collection will not be reflected in the other one.

Specific collections (e.g. ParArray or mutable.ParHashMap) override this default behaviour by creating a parallel collection which shares the same underlying dataset. For these collections, par takes constant or sublinear time.

All parallel collections return a reference to themselves.

returns: a parallel implementation of this collection

Definition Classes: ArrayOps → CustomParallelizable → Parallelizable

def parCombiner: Combiner[Unit, ParArray[Unit]]

The default par implementation uses the combiner provided by this method to create a new parallel collection.

returns: a combiner for the parallel collection of type ParRepr

Attributes: protected[this]
Definition Classes: CustomParallelizable → Parallelizable

def partition(p: (Unit) ⇒ Boolean): (Array[Unit], Array[Unit])

Partitions this traversable collection in two traversable collections according to a predicate.

p: the predicate on which to partition.
returns: a pair of traversable collections: the first traversable collection consists of all elements that satisfy the predicate p and the second traversable collection consists of all elements that don't. The relative order of the elements in the resulting traversable collections is the same as in the original traversable collection.

Definition Classes: TraversableLike → GenTraversableLike

def patch(from: Int, that: GenSeq[A], replaced: Int): Array[A]

[use case]

Produces a new mutable indexed sequence where a slice of elements in this mutable indexed sequence is replaced by another sequence.

from: the index of the first replaced element
replaced: the number of elements to drop in the original mutable indexed sequence
returns: a new mutable indexed sequence consisting of all elements of this mutable indexed sequence except that replaced elements starting from from are replaced by patch.

Definition Classes: SeqLike → GenSeqLike

def permutations: Iterator[Array[Unit]]

Iterates over distinct permutations.

returns: An Iterator which traverses the distinct permutations of this sequence.

Definition Classes: SeqLike

def prefixLength(p: (Unit) ⇒ Boolean): Int

Returns the length of the longest prefix whose elements all satisfy some predicate.

Note: may not terminate for infinite-sized collections.

p: the predicate used to test elements.
returns: the length of the longest prefix of this general sequence such that every element of the segment satisfies the predicate p.

Definition Classes: GenSeqLike

def product: A

[use case]

Multiplies up the elements of this collection.

returns: the product of all elements in this mutable indexed sequence 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 mutable indexed sequence and as result type of product. Examples of such types are: Long, Float, Double, BigInt.

Definition Classes: TraversableOnce → GenTraversableOnce

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

Applies a binary operator to all elements of this sequence, going left to right.

B

the result type of the binary operator.

op

the binary operator.

returns

the result of inserting op between consecutive elements of this sequence, 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 sequence.

Definition Classes: IndexedSeqOptimized → TraversableOnce
Exceptions thrown: UnsupportedOperationException if this sequence is empty.

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

Applies a binary operator to all elements of this sequence, going right to left.

B

the result type of the binary operator.

op

the binary operator.

returns

the result of inserting op between consecutive elements of this sequence, 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 sequence.

Definition Classes: IndexedSeqOptimized → IterableLike → TraversableOnce → GenTraversableOnce
Exceptions thrown: UnsupportedOperationException if this sequence is empty.

def reduceRightOption[B >: Unit](op: (Unit, 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

val repr: Array[Unit]

The collection of type mutable indexed sequence underlying this TraversableLike object. By default this is implemented as the TraversableLike object itself, but this can be overridden.

Definition Classes: ofUnit → TraversableLike → GenTraversableLike

def reverse: Array[Unit]

Returns new sequence with elements in reversed order.

returns: A new sequence with all elements of this sequence in reversed order.

Definition Classes: IndexedSeqOptimized → SeqLike → GenSeqLike

def reverseIterator: Iterator[Unit]

An iterator yielding elements in reversed order.

Note: xs.reverseIterator is the same as xs.reverse.iterator but might be more efficient.

returns: an iterator yielding the elements of this sequence in reversed order

Definition Classes: IndexedSeqOptimized → SeqLike

def reverseMap[B](f: (A) ⇒ B): Array[B]

[use case]

Builds a new collection by applying a function to all elements of this mutable indexed sequence and collecting the results in reversed order.

Note: xs.reverseMap(f) is the same as xs.reverse.map(f) but might be more efficient.

B: the element type of the returned collection.
f: the function to apply to each element.
returns: a new mutable indexed sequence resulting from applying the given function f to each element of this mutable indexed sequence and collecting the results in reversed order.

Definition Classes: SeqLike → GenSeqLike

def reversed: List[Unit]

Attributes: protected[this]
Definition Classes: TraversableOnce

def sameElements(that: GenIterable[A]): Boolean

[use case]

Checks if the other iterable collection contains the same elements in the same order as this mutable indexed sequence.

that: the collection to compare with.
returns: true, if both collections contain the same elements in the same order, false otherwise.

Definition Classes: IndexedSeqOptimized → IterableLike → GenIterableLike

def scan[B >: Unit, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[Array[Unit], B, That]): That

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
That: type of the resulting collection
z: neutral element for the operator op
op: the associative operator for the scan
cbf: combiner factory which provides a combiner
returns: a new traversable collection containing the prefix scan of the elements in this traversable collection

Definition Classes: TraversableLike → GenTraversableLike

def scanLeft[B, That](z: B)(op: (B, Unit) ⇒ B)(implicit bf: CanBuildFrom[Array[Unit], B, That]): That

Produces a collection containing cumulative results of applying the operator 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.

B: the type of the elements in the resulting collection
That: the actual type of the resulting collection
z: the initial value
op: the binary operator applied to the intermediate result and the element
bf: an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.
returns: collection with intermediate results

Definition Classes: TraversableLike → GenTraversableLike

def scanRight[B, That](z: B)(op: (Unit, B) ⇒ B)(implicit bf: CanBuildFrom[Array[Unit], B, That]): That

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-sized collections.

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

Example:

List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)

B: the type of the elements in the resulting collection
That: the actual type of the resulting collection
z: the initial value
op: the binary operator applied to the intermediate result and the element
bf: an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type B.
returns: collection with intermediate results

Definition Classes: TraversableLike → GenTraversableLike
Annotations: @migration
Migration: (Changed in version 2.9.0) The behavior of scanRight has changed. The previous behavior can be reproduced with scanRight.reverse.

def segmentLength(p: (Unit) ⇒ Boolean, from: Int): Int

Computes length of longest segment whose elements all satisfy some predicate.

p: the predicate used to test elements.
from: the index where the search starts.
returns: the length of the longest segment of this sequence starting from index from such that every element of the segment satisfies the predicate p.

Definition Classes: IndexedSeqOptimized → SeqLike → GenSeqLike

def seq: IndexedSeq[Unit]

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: ArrayOps → IndexedSeqLike → GenSeqLike → Parallelizable → TraversableOnce → GenTraversableOnce

def size: Int

The size of this sequence, equivalent to length.

Note: will not terminate for infinite-sized collections.

returns: the number of elements in this sequence.

Definition Classes: SeqLike → GenTraversableLike → TraversableOnce → GenTraversableOnce

def sizeHintIfCheap: Int

The size of this sequence, if it can be cheaply computed

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

Attributes: protected[collection]
Definition Classes: IndexedSeqLike → GenTraversableOnce

def slice(from: Int, until: Int): Array[Unit]

Selects an interval of elements. The returned collection is made up of all elements x which satisfy the invariant:

from <= indexOf(x) < until

returns: a mutable indexed sequence containing the elements greater than or equal to index from extending up to (but not including) index until of this mutable indexed sequence.

Definition Classes: ArrayOps → IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike

def sliding(size: Int, step: Int): Iterator[Array[Unit]]

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 iterable collections 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: IterableLike
See also: scala.collection.Iterator, method sliding

def sliding(size: Int): Iterator[Array[Unit]]

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 iterable collections 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: IterableLike
See also: scala.collection.Iterator, method sliding

def sortBy[B](f: (Unit) ⇒ B)(implicit ord: math.Ordering[B]): Array[Unit]

Sorts this Seq 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 sequence consisting of the elements of this sequence sorted according to the ordering where x < y if ord.lt(f(x), f(y)).

Definition Classes: SeqLike
See also: scala.math.Ordering Note: will not terminate for infinite-sized collections.

def sortWith(lt: (Unit, Unit) ⇒ Boolean): Array[Unit]

Sorts this sequence according to a comparison function.

Note: will not terminate for infinite-sized collections.

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 sequence consisting of the elements of this sequence sorted according to the comparison function lt.

Definition Classes: SeqLike

def sorted[B >: Unit](implicit ord: math.Ordering[B]): Array[Unit]

Sorts this sequence 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 sequence consisting of the elements of this sequence sorted according to the ordering ord.

Definition Classes: SeqLike
See also: scala.math.Ordering

def span(p: (Unit) ⇒ Boolean): (Array[Unit], Array[Unit])

Splits this sequence 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.

returns: a pair consisting of the longest prefix of this sequence whose elements all satisfy p, and the rest of this sequence.

Definition Classes: IndexedSeqOptimized → TraversableLike → GenTraversableLike

def splitAt(n: Int): (Array[Unit], Array[Unit])

Splits this sequence into two at a given position. Note: c splitAt n is equivalent to (but possibly more efficient than) (c take n, c drop n).

n: the position at which to split.
returns: a pair of sequences consisting of the first n elements of this sequence, and the other elements.

Definition Classes: IndexedSeqOptimized → TraversableLike → GenTraversableLike

def startsWith[B](that: GenSeq[B], offset: Int): Boolean

Tests whether this sequence 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 sequence at index offset, otherwise false.

Definition Classes: IndexedSeqOptimized → SeqLike → GenSeqLike

def startsWith[B](that: GenSeq[B]): Boolean

Tests whether this general sequence starts with the given sequence.

that: the sequence to test
returns: true if this collection has that as a prefix, false otherwise.

Definition Classes: GenSeqLike

def stringPrefix: String

Defines the prefix of this object's toString representation.

returns: a string representation which starts the result of toString applied to this traversable collection. By default the string prefix is the simple name of the collection class traversable collection.

Definition Classes: TraversableLike → GenTraversableLike

def sum: A

[use case]

Sums up the elements of this collection.

returns: the sum of all elements in this mutable indexed sequence 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 mutable indexed sequence and as result type of sum. Examples of such types are: Long, Float, Double, BigInt.

Definition Classes: TraversableOnce → GenTraversableOnce

def tail: Array[Unit]

Selects all elements except the first.

returns: a sequence consisting of all elements of this sequence except the first one.

Definition Classes: IndexedSeqOptimized → TraversableLike → GenTraversableLike
Exceptions thrown: java.lang.UnsupportedOperationException if the sequence is empty.

def tails: Iterator[Array[Unit]]

Iterates over the tails of this traversable collection. The first value will be this traversable collection and the final one will be an empty traversable collection, with the intervening values the results of successive applications of tail.

returns: an iterator over all the tails of this traversable collection

Definition Classes: TraversableLike

def take(n: Int): Array[Unit]

Selects first n elements.

n: the number of elements to take from this sequence.
returns: a sequence consisting only of the first n elements of this sequence, or else the whole sequence, if it has less than n elements. If n is negative, returns an empty sequence.

Definition Classes: IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike

def takeRight(n: Int): Array[Unit]

Selects last n elements.

n: the number of elements to take
returns: a sequence consisting only of the last n elements of this sequence, or else the whole sequence, if it has less than n elements.

Definition Classes: IndexedSeqOptimized → IterableLike

def takeWhile(p: (Unit) ⇒ Boolean): Array[Unit]

Takes longest prefix of elements that satisfy a predicate.

returns: the longest prefix of this sequence whose elements all satisfy the predicate p.

Definition Classes: IndexedSeqOptimized → IterableLike → TraversableLike → GenTraversableLike

def thisCollection: WrappedArray[Unit]

The underlying collection seen as an instance of Array. By default this is implemented as the current collection object itself, but this can be overridden.

Attributes: protected[this]
Definition Classes: ofUnit → IndexedSeqLike → IndexedSeqLike → SeqLike → IterableLike → TraversableLike

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

[use case]

Converts this mutable indexed sequence into another by copying all elements.

Col: The collection type to build.
returns: a new collection containing all elements of this mutable indexed sequence.

Definition Classes: TraversableLike → TraversableOnce → GenTraversableOnce

def toArray: Array[A]

[use case]

Converts this mutable indexed sequence to an array.

returns: an array containing all elements of this mutable indexed sequence. An ClassTag must be available for the element type of this mutable indexed sequence.

Definition Classes: ArrayOps → TraversableOnce → GenTraversableOnce

def toBuffer[A1 >: Unit]: Buffer[A1]

Uses the contents of this sequence to create a new mutable buffer.

returns: a buffer containing all elements of this sequence.

Definition Classes: IndexedSeqLike → TraversableOnce → GenTraversableOnce

def toCollection(repr: Array[Unit]): WrappedArray[Unit]

A conversion from collections of type Repr to Array objects. By default this is implemented as just a cast, but this can be overridden.

Attributes: protected[this]
Definition Classes: ofUnit → IndexedSeqLike → IndexedSeqLike → SeqLike → IterableLike → TraversableLike

def toIndexedSeq: immutable.IndexedSeq[Unit]

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: collection.Iterable[Unit]

Returns this iterable collection as an iterable collection.

A new collection will not be built; lazy collections will stay lazy.

Note: will not terminate for infinite-sized collections.

returns: an Iterable containing all elements of this iterable collection.

Definition Classes: IterableLike → TraversableOnce → GenTraversableOnce

def toIterator: Iterator[Unit]

Returns an Iterator over the elements in this iterable collection. Produces the same result as iterator.

Note: will not terminate for infinite-sized collections.

returns: an Iterator containing all elements of this iterable collection.

Definition Classes: IterableLike → TraversableLike → GenTraversableOnce
Annotations: @deprecatedOverriding( message = ... , since = "2.11.0" )

def toList: List[Unit]

Converts this sequence to a list.

returns: a list containing all elements of this sequence.

Definition Classes: IndexedSeqOptimized → TraversableOnce → GenTraversableOnce

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

[use case]

Converts this mutable indexed sequence 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.

returns: a map of type immutable.Map[T, U] containing all key/value pairs of type (T, U) of this mutable indexed sequence.

Definition Classes: TraversableOnce → GenTraversableOnce

def toParArray: ParArray[T]

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

def toSeq: collection.Seq[Unit]

Converts this sequence to a sequence.

Note: will not terminate for infinite-sized collections.

A new collection will not be built; in particular, lazy sequences will stay lazy.

returns: a sequence containing all elements of this sequence.

Definition Classes: SeqLike → GenSeqLike → TraversableOnce → GenTraversableOnce

def toSet[B >: Unit]: 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[Unit]

Converts this iterable collection to a stream.

returns: a stream containing all elements of this iterable collection.

Definition Classes: IterableLike → TraversableLike → GenTraversableOnce

def toString(): String

Converts this sequence to a string.

returns: a string representation of this collection. By default this string consists of the stringPrefix of this sequence, followed by all elements separated by commas and enclosed in parentheses.

Definition Classes: SeqLike → TraversableLike → Any

def toTraversable: collection.Traversable[Unit]

Converts this traversable collection to an unspecified Traversable. Will return the same collection if this instance is already Traversable.

Note: will not terminate for infinite-sized collections.

returns: a Traversable containing all elements of this traversable collection.

Definition Classes: TraversableLike → TraversableOnce → GenTraversableOnce
Annotations: @deprecatedOverriding( message = ... , since = "2.11.0" )

def toVector: Vector[Unit]

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

def transpose[U](implicit asArray: (Unit) ⇒ Array[U]): Array[Array[U]]

Transposes a two dimensional array.

U: Type of row elements.
asArray: A function that converts elements of this array to rows - arrays of type U.
returns: An array obtained by replacing elements of this arrays with rows the represent.

Definition Classes: ArrayOps

def union(that: collection.Seq[Unit]): Array[Unit]

[use case]

Produces a new sequence which contains all elements of this mutable indexed sequence and also all elements of a given sequence. xs union ys is equivalent to xs ++ ys.

Another way to express this is that xs union ys computes the order-preserving multi-set union of xs and ys. union is hence a counter-part of diff and intersect which also work on multi-sets.

that: the sequence to add.
returns: a new mutable indexed sequence which contains all elements of this mutable indexed sequence followed by all elements of that.

Definition Classes: SeqLike → GenSeqLike

def unzip[T1, T2](implicit asPair: (Unit) ⇒ (T1, T2), ct1: ClassTag[T1], ct2: ClassTag[T2]): (Array[T1], Array[T2])

Converts an array of pairs into an array of first elements and an array of second elements.

T1: the type of the first half of the element pairs
T2: the type of the second half of the element pairs
asPair: an implicit conversion which asserts that the element type of this Array is a pair.
ct1: a class tag for T1 type parameter that is required to create an instance of Array[T1]
ct2: a class tag for T2 type parameter that is required to create an instance of Array[T2]
returns: a pair of Arrays, containing, respectively, the first and second half of each element pair of this Array.

Definition Classes: ArrayOps

def unzip3[T1, T2, T3](implicit asTriple: (Unit) ⇒ (T1, T2, T3), ct1: ClassTag[T1], ct2: ClassTag[T2], ct3: ClassTag[T3]): (Array[T1], Array[T2], Array[T3])

Converts an array of triples into three arrays, one containing the elements from each position of the triple.

T1: the type of the first of three elements in the triple
T2: the type of the second of three elements in the triple
T3: the type of the third of three elements in the triple
asTriple: an implicit conversion which asserts that the element type of this Array is a triple.
ct1: a class tag for T1 type parameter that is required to create an instance of Array[T1]
ct2: a class tag for T2 type parameter that is required to create an instance of Array[T2]
ct3: a class tag for T3 type parameter that is required to create an instance of Array[T3]
returns: a triple of Arrays, containing, respectively, the first, second, and third elements from each element triple of this Array.

Definition Classes: ArrayOps

def update(index: Int, elem: Unit): Unit

Replaces element at given index with a new value.

elem: the new value.

Definition Classes: ofUnit → IndexedSeqLike
Exceptions thrown: IndexOutOfBoundsException if the index is not valid.

def updated(index: Int, elem: A): Array[A]

[use case]

A copy of this mutable indexed sequence with one single replaced element.

index: the position of the replacement
elem: the replacing element
returns: a copy of this mutable indexed sequence with the element at position index replaced by elem.

Definition Classes: SeqLike → GenSeqLike

def view(from: Int, until: Int): IndexedSeqView[Unit, Array[Unit]]

A sub-sequence view starting at index from and extending up to (but not including) index until.

from: The index of the first element of the slice
until: The index of the element following the slice
returns: a non-strict view of a slice of this mutable indexed sequence, starting at index from and extending up to (but not including) index until.@note The difference between view and slice is that view produces a view of the current sequence, whereas slice produces a new sequence.

Definition Classes: IndexedSeqLike → SeqLike → IterableLike → TraversableLike
Note: view(from, to) is equivalent to view.slice(from, to)

def view: IndexedSeqView[Unit, Array[Unit]]

Creates a view of this iterable @see Iterable.View

returns: a non-strict view of this mutable indexed sequence.

Definition Classes: IndexedSeqLike → SeqLike → IterableLike → TraversableLike

def withFilter(p: (Unit) ⇒ Boolean): FilterMonadic[Unit, Array[Unit]]

Creates a non-strict filter of this traversable collection.

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.

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

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 traversable collection which satisfy the predicate p.

Definition Classes: TraversableLike → FilterMonadic

def zip[B](that: GenIterable[B]): Array[(A, B)]

[use case]

Returns a mutable indexed sequence formed from this mutable indexed sequence 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
that: The iterable providing the second half of each result pair
returns: a new mutable indexed sequence containing pairs consisting of corresponding elements of this mutable indexed sequence and that. The length of the returned collection is the minimum of the lengths of this mutable indexed sequence and that.

Definition Classes: IndexedSeqOptimized → IterableLike → GenIterableLike

def zipAll[B](that: collection.Iterable[B], thisElem: A, thatElem: B): Array[(A, B)]

[use case]

Returns a mutable indexed sequence formed from this mutable indexed sequence and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.

B: the type of the second half of the returned pairs
that: The iterable providing the second half of each result pair
thisElem: the element to be used to fill up the result if this mutable indexed sequence is shorter than that.
thatElem: the element to be used to fill up the result if that is shorter than this mutable indexed sequence.
returns: a new mutable indexed sequence containing pairs consisting of corresponding elements of this mutable indexed sequence and that. The length of the returned collection is the maximum of the lengths of this mutable indexed sequence and that. If this mutable indexed sequence is shorter than that, thisElem values are used to pad the result. If that is shorter than this mutable indexed sequence, thatElem values are used to pad the result.

Definition Classes: IterableLike → GenIterableLike

def zipWithIndex: Array[(A, Int)]

[use case]

Zips this mutable indexed sequence with its indices.

returns: A new mutable indexed sequence containing pairs consisting of all elements of this mutable indexed sequence paired with their index. Indices start at 0.

Definition Classes: IndexedSeqOptimized → IterableLike → GenIterableLike

def →[B](y: B): (ofUnit, B)

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

Shadowed Implicit Value Members

def filter(p: (Unit) ⇒ Boolean): TraversableOnce[Unit]

Implicit

This member is added by an implicit conversion from ofUnit to MonadOps[Unit] 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:

(ofUnit: MonadOps[Unit]).filter(p)

Definition Classes

MonadOps

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

Implicit

This member is added by an implicit conversion from ofUnit to MonadOps[Unit] 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:

(ofUnit: MonadOps[Unit]).flatMap(f)

Definition Classes

MonadOps

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

Implicit

This member is added by an implicit conversion from ofUnit to MonadOps[Unit] 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:

(ofUnit: MonadOps[Unit]).map(f)

Definition Classes

MonadOps

def withFilter(p: (Unit) ⇒ Boolean): Iterator[Unit]

Implicit

This member is added by an implicit conversion from ofUnit to MonadOps[Unit] 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:

(ofUnit: MonadOps[Unit]).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/mutable/ArrayOps$$ofUnit.html