Kotlin Programming Cookbook

How to do it...

Let's write a simple program that takes in a number as an input and assigns its value to a variable. If the entered value is not a number, we catch the NumberFormatException exception and assign -1 to that variable:

fun main(args: Array<String>) { val str="23" val a: Int? = try { str.toInt() } catch (e: NumberFormatException) { -1 } println(a) }

This is the output:

Output: 23

Now, let's try something crazy and deliberately try to throw the exception:

fun main(args: Array<String>) { val str="abc" val a: Int? = try { str.toInt() } catch (e: NumberFormatException) { -1 } println(a) }

This is the output:

Output: -1

The usage of try–catch will help you a lot in edge cases as they can be used as an expression.