Operator Functions
Learn how to define your own operators, which limitations Kotlin poses on such operators, and how they lead to succinct code.
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Operator functions allow you to define the meaning of well-known symbols such as + and - for your own types.
Introducing Operators #
Kotlin’s operators allow calling functions using certain symbols. For instance, the infix + operator actually calls a plus function so that a + b translates to a.plus(b) under the hood.
Many operators use infix notation and therefore can be seen as an extension of infix functions. Instead of a function name, operator functions instead use an operator symbol. However, there are also operators using prefix and postfix notation:
- Prefix:
+a,-a,!a - Infix:
a * b,a..b,a == b, … - Postfix:
a[i],a()
Kotlin has a predefined list of possible operators you can use (in contrast to languages like Scala or Haskell).
Important Kotlin Operators #
Note: Some of ...