How to Join Lists in Kotlin

How to Join Lists in Kotlin ?

Answer

To join lists in Kotlin, you can use the `plus` operator or the `addAll` method to combine multiple lists into a single list.

✐ Examples

1 Join Two Lists of Integers

In this example,

We create two lists named list1 and list2 with integer values.
We use the plus operator to join list1 and list2 into a new list named joinedList.
Finally, we print the joined list to verify the result.

Kotlin Program

fun main(args: Array<String>) {
    val list1 = listOf(1, 2, 3)
    val list2 = listOf(4, 5, 6)
    val joinedList = list1 + list2
    println("Joined List: $joinedList")
}

Output

Joined List: [1, 2, 3, 4, 5, 6]

2 Join Multiple Lists of Strings

In this example,

We create three lists named listA, listB, and listC with string values.
We create a mutable list named resultList and use the addAll method to add all elements from listA, listB, and listC to resultList.
Finally, we print the joined list to verify the result.

Kotlin Program

fun main(args: Array<String>) {
    val listA = listOf("apple", "banana")
    val listB = listOf("cherry", "date")
    val listC = listOf("fig", "grape")
    val resultList = mutableListOf<String>()
    resultList.addAll(listA)
    resultList.addAll(listB)
    resultList.addAll(listC)
    println("Joined List: $resultList")
}

Output

Joined List: [apple, banana, cherry, date, fig, grape]

Summary

In this tutorial, we learned How to Join Lists in Kotlin language with well detailed examples.

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How to Join Lists in Kotlin

How to Join Lists in Kotlin ?

Answer

✐ Examples

1 Join Two Lists of Integers

Kotlin Program

Output

2 Join Multiple Lists of Strings

Kotlin Program

Output

Summary

More Kotlin Lists Tutorials