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contains

kotlin-stdlib / kotlin.collections / HashSet / 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