kotlin-stdlib/kotlin.collections/List/indexOf

indexOf

abstract fun indexOf(element: @UnsafeVariance E): Int(source)

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.

Since Kotlin

1.0
abstract fun indexOf(element: @UnsafeVariance E): Int(source)

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.

Since Kotlin

1.3