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contains

Platform and version requirements: JVM (1.0), JS (1.1), Native (1.3)
abstract operator fun contains(
    element: @UnsafeVariance 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/-collection/contains.html