How to do it...

Create a file and name it whenWithObject.kt, and then, let's try when with a custom object. In this example, we will create an object with some properties and try to match it in a when statement:

fun main(args: Array<String>) {
     val x = ob(2, true, 500)
     when(x){
         ob(2, true, 500) -> println("equals correct object")
         ob(12, false, 800) -> {
             println("equals wrong object")
         }
         else -> println("does not match any object")
     }
 }
data class ob(val value: Int, val valid: Boolean, val max: Int)

Here's the output of the preceding code block:

If you try to compare a different object type in when, it throws an error error: incompatible types because we are trying to compare objects of different types.