The when without argument

The second form of when is used without an argument, and is a drop-in replacement for if...else clauses. This can sometimes result in clearer code, especially if many of the conditions are simple comparisons. The following example shows a way of writing the same code using when:

    fun whenWithoutArgs(x: Int, y: Int) { 
      when { 
        x < y -> println("x is less than y") 
        x > y -> println("X is greater than y") 
        else -> println("X must equal y") 
      } 
    }