Convert a string array to an Int array in Kotlin

This article explores different ways to convert a String Array to an Int Array in Kotlin.

1. Using `map()` function

The standard solution is to use the map { … } with toInt() or toIntOrNull() function to convert each string in the string array to an integer. This results in a list, which can be converted to an integer array with toTypedArray() or toIntArray() function.

fun main() {

val strings: Array<String> = arrayOf("2", "4", "6", "8");

val ints = strings.map { it.toInt() }.toTypedArray()

print(ints.contentToString()) // [2, 4, 6, 8]

}

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If you need an extension function, do like:

fun Array<String>.toIntArray() = this.map { it.toInt() }.toTypedArray()

fun main() {

val strings: Array<String> = arrayOf("2", "4", "6", "8");

val ints = strings.toIntArray()

print(ints.contentToString()) // [2, 4, 6, 8]

}

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2. Using `forEach()` function

Another approach is to use the forEach. The idea is to create an integer array and assign values to it after converting the string values to an integer.

fun main() {

val strings: Array<String> = arrayOf("2", "4", "6", "8");

val ints = IntArray(strings.size)

strings.indices.forEach { ints[it] = strings[it].toInt() }

print(ints.contentToString()) // [2, 4, 6, 8]

}

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That’s all about converting a string array to an Int array in Kotlin.

Convert a string array to an Int array in Kotlin

1. Using map() function

2. Using forEach() function

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1. Using `map()` function

2. Using `forEach()` function