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add

Platform and version requirements: JVM (1.0), JS (1.1), Native (1.3)
abstract fun add(element: E): Boolean

Adds the specified element to the set.

Return true if the element has been added, false if the element is already contained in the set.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-set/add.html