open fun add(element: E): Boolean
Overrides AbstractMutableCollection.add
Overrides MutableSet.add
Platform and version requirements: JS
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.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-hash-set/-hash-set/add.html