Scala 3/scala.collection.mutable/GrowableBuilder

GrowableBuilder

class GrowableBuilder[Elem, To <: Growable[Elem]](val elems: To) extends Builder[Elem, To]

The canonical builder for collections that are growable, i.e. that support an efficient += method which adds an element to the collection.

GrowableBuilders can produce only a single instance of the collection they are growing.

Source
GrowableBuilder.scala
trait Builder[Elem, To]
trait Growable[Elem]
trait Clearable
class Object
trait Matchable
class Any

Value members

Concrete methods

override def addAll(xs: IterableOnce[Elem]): GrowableBuilder[Elem, To]
Definition Classes
Source
GrowableBuilder.scala
override def knownSize: Int
Definition Classes
Source
GrowableBuilder.scala

Inherited methods

final def ++=(xs: IterableOnce[Elem]): GrowableBuilder[Elem, To]

Alias for addAll

Alias for addAll

Inherited from
Growable
Source
Growable.scala
final def +=(elem: Elem): GrowableBuilder[Elem, To]

Alias for addOne

Alias for addOne

Inherited from
Growable
Source
Growable.scala
def mapResult[NewTo](f: To => NewTo): Builder[Elem, NewTo]

A builder resulting from this builder my mapping the result using f.

A builder resulting from this builder my mapping the result using f.

Inherited from
Builder
Source
Builder.scala
final def sizeHint(coll: IterableOnce[_], delta: Int): Unit

Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta.

Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection has a known size Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

Value Params
coll

the collection which serves as a hint for the result's size.

delta

a correction to add to the coll.size to produce the size hint.

Inherited from
Builder
Source
Builder.scala
def sizeHint(size: Int): Unit

Gives a hint how many elements are expected to be added when the next result is called.

Gives a hint how many elements are expected to be added when the next result is called. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

Value Params
size

the hint how many elements will be added.

Inherited from
Builder
Source
Builder.scala
final def sizeHintBounded(size: Int, boundingColl: Iterable[_]): Unit

Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection.

Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

Value Params
boundingColl

the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.

size

the hint how many elements will be added.

Inherited from
Builder
Source
Builder.scala

Deprecated and Inherited methods

@deprecated("Use `++=` aka `addAll` instead of varargs `+=`; infix operations with an operand of multiple args will be deprecated", "2.13.0") @inline
final def +=(elem1: Elem, elem2: Elem, elems: Elem*): GrowableBuilder[Elem, To]

Adds two or more elements to this growable collection.

Adds two or more elements to this growable collection.

Value Params
elem1

the first element to add.

elem2

the second element to add.

elems

the remaining elements to add.

Returns

the growable collection itself

Deprecated
Inherited from
Growable
Source
Growable.scala