Delegated Properties

Delegation without the mystification, part 2 — introduction to delegating properties via getValue and setValue, ReadOnlyProperty and ReadWriteProperty. A quick mention of lazy, observable, and delegating to different properties.

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THE CURRENT VERSION OF THIS ARTICLE IS PUBLISHED HERE.

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Tags: #FUNDAMENTAL CONCEPT #EXERCISE

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.

Delegation can also help with the repetition involved when defining properties and their getters and setters.

A good example is an observable property — a property where a callback should be called…