In this tutorial, you shall learn how to sort an array of integers in Kotlin, using Array.sort() method, with examples.

Kotlin – Sort Array of Integers

To sort an Array of Integers in Kotlin, use Array.sort() method. sort() method sorts the calling array in-place in ascending order. To sort Integer Array in descending order, call sortDescending() method on this Array.

Syntax

The syntax to call sort() method on Array arr is

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arr.sort()

The syntax to call sortDescending() method on Array arr is

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arr.sortDescending()

Examples

Sort in Ascending Order

In the following example, we take an array of integers, and sort them in ascending order in-place using sort() method.

Main.kt

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fun main(args: Array<String>) {
    val arr = arrayOf(2, 4, 1, 3, 6, 5)
    arr.sort()
    for (x in arr) print("$x  ")
}

Output

1  2  3  4  5  6

Sort in Descending Order

In the following example, we take an array of integers, and sort them in descending order in-place using sortDescending() method.

Main.kt

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fun main(args: Array<String>) {
    val arr = arrayOf(2, 4, 1, 3, 6, 5)
    arr.sortDescending()
    for (x in arr) print("$x  ")
}

Output

6  5  4  3  2  1

Conclusion

In this Kotlin Tutorial, we learned how to sort an Integer Array in ascending or descending order using sort() or sortDescending() methods respectively, with examples.