Collection Operations: Single Element Access

An introduction to the most important functions for single element access: find, first, last, indexOf, lastIndexOf, single, and their variants.

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THE CURRENT VERSION OF THIS ARTICLE IS PUBLISHED HERE.

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Tags: #FYI++

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.

find

inline fun <T> Iterable<T>.find(predicate: (T) -> Boolean): T?

The find function searches for the first element satisfying a predicate and returns it. If no such element is found, it returns null.

Example