Kotlin String to Int or zero (default value)

Question

How can I covert String to Int in Kotlin and if it can't be then return 0 (default value).

Answer 1

I think the best solution is to tell value is Int and use Elvis operator to assign value 0 if it can't be converted.

val a:String="22"
val b:Int = a.toIntOrNull()?:0//22
val c:String="a"
val d:Int = c.toIntOrNull()?:0//0

Answer 2

To make code more concise you can create Extension Function

fun String?.toIntOrDefault(default: Int = 0): Int {
    return this?.toIntOrNull()?:default
}