Kotlin Programming Cookbook

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Let's try an example with the as operator, which is used for casting in Kotlin. It is an unsafe cast operator. The following code example throws ClassCastException, because we cannot convert an integer to string:

fun main(args: Array<String>) {   var a : Any = 1   var b = a as String}

On the other hand, the following code runs successfully because of variable a, which, being of Any type, can be cast to String:

fun main(args: Array<String>) {    var a : Any = "1"    var b = a as String    println(b.length)}