Android Development with Kotlin

Increment and decrement operators

There are two kinds of increment (++ ) and decrements (--) operator: pre-increment/pre-decrement, where the operator is defined before the expression, and post-increment/post-decrement, where the operator is defined after the expression:

    ++speed //pre increment    --speed //pre decrement     speed++ //post increment     speed-- //post decrement

In the preceding example, using post- instead of pre-increment/decrement would change nothing because those operations are executed in sequence. But this makes a huge difference when the increment/decrement operator is combined with a function call.

In the pre-increment operator, speed is retrieved, incremented, and passed to a function as an argument:

 var speed = 1.0 println(++speed) ...