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Showing content from http://www.scala-lang.org/api/current/scala/collection/mutable/Builder.html below:

Builder

scala.collection.mutable.Builder

Base trait for collection builders.

After calling result() the behavior of a Builder (which is not also a scala.collection.mutable.ReusableBuilder) is undefined. No further methods should be called. It is common for mutable collections to be their own non-reusable Builder, in which case result() simply returns this.

See also

Source

Builder.scala

Graph

Supertypes

Known subtypes

trait

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Self type

Clears the contents of this builder.

Clears the contents of this builder. After execution of this method the builder will contain no elements.

Source

Builder.scala

Result collection consisting of all elements appended so far.

Result collection consisting of all elements appended so far.

Source

Builder.scala

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

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

Source

Builder.scala

Gives a hint how many elements are expected to be added in total by the time result is called.

Gives a hint how many elements are expected to be added in total by the time result is called.

Some builder classes will optimize their representation based on the hint. However, builder implementations are required to work correctly even if the hint is wrong, e.g., a different number of elements is added, or the hint is out of range.

The default implementation simply ignores the hint.

size

the hint how many elements will be added.

Source

Builder.scala

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

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

This method provides a hint only if the collection has a known size, as specified by the following pseudocode:

if (coll.knownSize != -1)
  if (coll.knownSize + delta <= 0) sizeHint(0)
  else sizeHint(coll.knownSize + delta)

If the delta is negative and the result size is known to be negative, then the size hint is issued at zero.

Some builder classes will optimize their representation based on the hint. However, builder implementations are required to work correctly even if the hint is wrong, i.e., if a different number of elements is added.

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 (zero if omitted).

Source

Builder.scala

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.

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.

Source

Builder.scala

Adds all elements produced by an IterableOnce to this growable collection.

Adds all elements produced by an IterableOnce to this growable collection.

elems

the IterableOnce producing the elements to add.

Returns

the growable collection itself.

Inherited from:

Growable

Source

Growable.scala

The number of elements in the collection under construction, if it can be cheaply computed, -1 otherwise.

The number of elements in the collection under construction, if it can be cheaply computed, -1 otherwise.

Returns

The number of elements. The default implementation always returns -1.

Inherited from:

Growable

Source

Growable.scala

Adds a single element to this growable collection.

Adds a single element to this growable collection.

elem

the element to add.

Returns

the growable collection itself

Inherited from:

Growable

Source

Growable.scala

Adds two or more elements to this growable collection.

Adds two or more elements to this growable collection.

elem1

the first element to add.

elem2

the second element to add.

elems

the remaining elements to add.

Returns

the growable collection itself

Deprecated

[Since version 2.13.0] Use `++=` aka `addAll` instead of varargs `+=`; infix operations with an operand of multiple args will be deprecated

Inherited from:

Growable

Source

Growable.scala

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