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lastIndexOf

abstract fun lastIndexOf(element: @UnsafeVariance E): Int

Returns the index of the last 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/-list/last-index-of.html