Kotlin List – Remove all Elements

We can modify the contents of a List only if the list is mutable.

To remove all elements from a Mutable List in Kotlin, call clear() function on this list object.

The syntax of MutableList.clear() function is

MutableList.clear()

Example

In the following program, we will create a mutable list with some elements in it. We shall then clear the contents of this list using clear() function.

Main.kt

fun main(args: Array<String>) {
    val mutableList = mutableListOf(1, 3, 9, 16, 25)
    println("List before clearing : " + mutableList)
    mutableList.clear()
    println("List after  clearing : " + mutableList)
}

Output

List before clearing : [1, 3, 9, 16, 25]
List after  clearing : []

Conclusion

In this Kotlin Tutorial, we learned how to remove all the elements in a mutable list in Kotlin, using clear() function, with the help of example programs.