Kotlin Standard Library Cookbook

Getting ready

In order to overload the operator for the specific type, we need to provide a member function or an extension function with a fixed name corresponding to the operator. Additionally, functions that overload operators need to be marked with the operator keyword.

In the following tables, you can find grouped sets of operators available in the language with their corresponding expressions to which they are translated to:

Unary prefix

Operator	Expression
+a	a.unaryPlus()
-a	a.unaryMinus()
!a	a.not()

 

Incrementation and decrementation

Operator	Expression
a++	a.inc()
a--	a.dec()

 

Arithmetic

Operator	Expression
a + b	a.plus(b)
a - b	a.minus(b)
a * b	a.times(b)
a / b	a.div(b)
a % b	a.rem(b)
a..b ...