How to convert String to Int in Kotlin?

Question

I am working on a console application in Kotlin where I accept multiple arguments in main() function

fun main(args: Array) {
    /         


        

Answer 1

i would go with something like this.

import java.util.*

fun String?.asOptionalInt() = Optional.ofNullable(this).map { it.toIntOrNull() }

fun main(args: Array<String>) {
    val intArgs = args.map {
        it.asOptionalInt().orElseThrow {
            IllegalArgumentException("cannot parse to int $it")
        }
    }

    println(intArgs)
}

this is quite a nice way to do this, without introducing unsafe nullable values.