Hands-On Object-Oriented Programming with Kotlin

Converting from String to Integer

It is also possible to cast from String to Integer or from String to Double. To do this, create a String variable and cast it by using the toInt() function. See this example:

fun main (args: Array<String>) {   var stringValue: String = "125"   var intValue = stringValue.toInt()   println("From string to int $intValue")}

Everything is fine if the String variable contains a valid integer value, but if the String variable contains anything other than integer, Kotlin will throw a NumberCast exception. Update the following stringVariable in the previous example and verify the exception like so:

var stringValue : String = "A125"

To avoid this situation, Kotlin provides the toIntorNull function. This function will return ...