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How to Append a List to another List in Kotlin - Step by Step Examples

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How to Append a List to another List in Kotlin ?

Answer

To append a list to another list in Kotlin, you can use the addAll method or the spread operator (*).

✐ Examples

1 Append List Using addAll Method

In this example,

We create two lists: list1 and list2 with initial values.
We use the addAll method to append all elements of list2 to list1.
Finally, we print the updated list1 to standard output.

Kotlin Program

fun main() {
    val list1 = mutableListOf(1, 2, 3)
    val list2 = listOf(4, 5, 6)
    list1.addAll(list2)
    println("Updated list: $list1")
}

Output

Updated list: [1, 2, 3, 4, 5, 6]

2 Append List Using Spread Operator

In this example,

We create two lists: list1 and list2 with initial values.
We use the spread operator (*) to append all elements of list2 to list1.
Finally, we print the updated list1 to standard output.

Kotlin Program

fun main() {
    val list1 = mutableListOf(1, 2, 3)
    val list2 = listOf(4, 5, 6)
    list1 += list2
    println("Updated list: $list1")
}

Output

Updated list: [1, 2, 3, 4, 5, 6]

Summary

In this tutorial, we learned How to Append a List to another List in Kotlin language with well detailed examples.

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