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indexOf

kotlin-stdlib / kotlin.collections / ArrayList / indexOf
Platform and version requirements: 
fun indexOf(element: @UnsafeVariance E): Int
Platform and version requirements: JS (1.1) 
open fun indexOf(element: E): Int
Platform and version requirements: Native (1.3) 
fun indexOf(element: E): Int

Returns the index of the first occurrence of the specified element in the list, or -1 if the specified element is not contained in the list.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-array-list/index-of.html