kotlin-stdlib/kotlin.collections/AbstractMutableCollection/add

add

Common
abstract override fun add(element: E): Boolean
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abstract override fun add(element: E): Boolean
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Adds the specified element to the collection.

This method is redeclared as abstract, because it's not implemented in the base class, so it must be always overridden in the concrete mutable collection implementation.

Return

true if the element has been added, false if the collection does not support duplicates and the element is already contained in the collection.

JS
abstract override fun add(element: E): Boolean
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Adds the specified element to the collection.

Return

true if the element has been added, false if the collection does not support duplicates and the element is already contained in the collection.