Hands-On Object-Oriented Programming with Kotlin

Unsafe cast

The as operator is another method of type casting, but it is not considered a safe cast. Check out the following example of an unsafe cast:

fun myUnsafeCast(any : Any?) {    val s : String = any as String    println(s)}fun main (args: Array<String>) {    myUnsafetCast("Hello")}

This code will execute successfully because a string variable is passed to this function, but the following function calls will throw a TypeCastException:

myUnsafetCast(2)myUnsafetCast(null)

It is very important to secure our code before it crashes, so try to avoid unsafe casting. However, if it is necessary, do the following:

• Declare a nullable variable with ? to store the value
• Add a safe call with the as operator as ?

If the type casting is successful, it will ...