Collection Operations: Predicates
An introduction to the most important functions for predicates: all, any, none, isEmpty, isNotEmpty, ifEmpty, contains, containsAll, and their variants.
Published in
3 min readOct 29, 2022
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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.
all, any, none
inline fun <T> Iterable<T>.all(predicate: (T) -> Boolean): Booleaninline fun <T> Iterable<T>.any(predicate: (T) -> Boolean): Boolean
The all method accepts a predicate and returns true if every element satisfies the predicate, and false otherwise. The some…
