contains

Platform and version requirements:

fun contains(element: @UnsafeVariance E): Boolean

Platform and version requirements: JS (1.1)

open operator fun contains(element: E): Boolean

Platform and version requirements: Native (1.3)

fun contains(element: E): Boolean

Checks if the specified element is contained in this collection.

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