Kotlin List toIntArray()
Syntax & Examples

Syntax of List.toIntArray()

The syntax of List.toIntArray() extension function is:

fun Collection<Int>.toIntArray(): IntArray

This toIntArray() extension function of List returns an array of Int containing all of the elements of this collection.

✐ Examples

1 Example

In this example,

We create a list named intList containing integer values 1, 2, 3.
We use the toIntArray() function on intList to convert it to an IntArray.
We then print the intArray to standard output using contentToString().

Kotlin Program

fun main(args: Array<String>) {
    val intList = listOf(1, 2, 3)
    val intArray = intList.toIntArray()
    println(intArray.contentToString())
}

Output

[1, 2, 3]

2 Example

In this example,

We create a list named intList containing integer values 10, 20, 30.
We use the toIntArray() function on intList to convert it to an IntArray.
We then print the intArray to standard output using contentToString().

Kotlin Program

fun main(args: Array<String>) {
    val intList = listOf(10, 20, 30)
    val intArray = intList.toIntArray()
    println(intArray.contentToString())
}

Output

[10, 20, 30]

3 Example

In this example,

We create a list named intList containing integer values 0, -1, 5.
We use the toIntArray() function on intList to convert it to an IntArray.
We then print the intArray to standard output using contentToString().

Kotlin Program

fun main(args: Array<String>) {
    val intList = listOf(0, -1, 5)
    val intArray = intList.toIntArray()
    println(intArray.contentToString())
}

Output

[0, -1, 5]

Summary

In this Kotlin tutorial, we learned about toIntArray() extension function of List: the syntax and few working examples with output and detailed explanation for each example.