indexOfFirstOrNull
fun <T> Collection<T>.indexOfFirstOrNull(predicate: (T) -> Boolean): Int?
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Returns index of the first element matching the given predicate, or null if the collection does not contain such element.
Returns index of the first element matching the given predicate, or null if the array does not contain such element.
Returns index of the first element matching the given predicate, or null if the iterable does not contain such element.