indexOf
Platform and version requirements: JVM (1.0), JS (1.1), Native (1.3)
abstract fun indexOf(element: @UnsafeVariance 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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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index-of.html