Nullable & Generic Receivers

Defining extension with nullable and generic receivers, with a common source of confusion explained in the latter. A thorough set of exercises to really get extensions down.

— — — — — — — — — — — — — — —

THE CURRENT VERSION OF THIS ARTICLE IS PUBLISHED HERE.

— — — — — — — — — — — — — — —

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.

In this article, let’s go through some of the ways extensions interact with other Kotlin features, which might not be immediately apparent.

First off — receivers can be nullable: