open fun add(element: E): Boolean
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.
© 2010–2017 JetBrains s.r.o.
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-hash-set/add.html