kotlin-stdlib / kotlin.collections / ArrayList / add add Common 1.0 fun add(element: E): Boolean(source) JS 1.1 open fun add(element: E): Boolean(source) Adds the specified element to the end of this list. Return true because the list is always modified as the result of this operation. Common 1.0 fun add(index: Int, element: E)(source) JS 1.1 open fun add(index: Int, element: E)(source) Inserts an element into the list at the specified index.