Operators

A short exposition of operators, and why they should be used sparingly. Special mentions of invoke, componentN, contains and rangeTo, and the index array access operator [].

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THE CURRENT VERSION OF THIS ARTICLE IS PUBLISHED HERE.

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Tags: #KOTLIN FEATURE

This article is part of the Kotlin Primer, an opinionated guide to the Kotlin language, which is indented to help facilitate Kotlin adoption inside Java-centric organizations. It was originally written as an organizational learning resource for Etnetera a.s. and I would like to express my sincere gratitude for their support.

It is recommended to read the Introduction before moving on. Check out the Table of Contents for all articles.

Unlike Java, Kotlin allows you to provide custom implementations for a predefined set of operators. Operators are ordinary methods that can be called using a special syntax, e.g. operator fun plus() can be called using +, == calls equals, > calls compareTo etc.