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add

kotlin-stdlib / kotlin.collections / HashSet / add
Platform and version requirements: Native (1.3) 
fun add(element: E): Boolean
Platform and version requirements: JS (1.1) 
open 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/-hash-set/add.html