How to convert String array to Int array in Kotlin?

Question

Kotlin has many shorthands and interesting features. So, I wonder if there is some fast and short way of converting array of string to array of integers. Similar to this code in Python:

results = [int(i) for i in results] 

Answer 1

You can use .map { ... } with .toInt() or .toIntOrNull():

val result = strings.map { it.toInt() } 

Only the result is not an array but a list. It is preferable to use lists over arrays in non-performance-critical code, see the differences.

If you need an array, add .toTypedArray() or .toIntArray().

Answer 2

I'd use something simple like

val strings = arrayOf("1", "2", "3") val ints = ints.map { it.toInt() }.toTypedArray() 

Alternatively, if you're into extensions:

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