fun lastIndexOf(element: @UnsafeVariance E): Int
open fun lastIndexOf(element: E): Int
fun lastIndexOf(element: 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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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-array-list/last-index-of.html