How to create a List of Lists in Kotlin

How to create a List of Lists in Kotlin ?

Answer

To create a list of lists in Kotlin, you can use the `listOf` function to initialize the inner lists and then add them to the outer list.

✐ Examples

1 Create List of Lists

In this example,

We create two inner lists named list1 and list2 with some elements.
We create an outer list named listOfLists.
We add the inner lists list1 and list2 to the outer list listOfLists.
Finally, we print the list of lists to standard output.

Kotlin Program

fun main() {
    val list1 = listOf(1, 2, 3)
    val list2 = listOf("a", "b", "c")
    val listOfLists = listOf(list1, list2)
    println("List of lists: $listOfLists")
}

Output

List of lists: [[1, 2, 3], [a, b, c]]

2 Create List of Lists with Empty Inner Lists

In this example,

We create two empty inner lists named list3 and list4.
We create an outer list named listOfListsEmpty.
We add the empty inner lists list3 and list4 to the outer list listOfListsEmpty.
Finally, we print the list of lists with empty inner lists to standard output.

Kotlin Program

fun main() {
    val list3 = listOf<Int>()
    val list4 = listOf<String>()
    val listOfListsEmpty = listOf(list3, list4)
    println("List of lists with empty inner lists: $listOfListsEmpty")
}

Output

List of lists with empty inner lists: [[], []]

Summary

In this tutorial, we learned How to create a List of Lists in Kotlin language with well detailed examples.

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How to create a List of Lists in Kotlin

How to create a List of Lists in Kotlin ?

Answer

✐ Examples

1 Create List of Lists

Kotlin Program

Output

2 Create List of Lists with Empty Inner Lists

Kotlin Program

Output

Summary

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