Groovy Collections

Working with Groovy collections: lists, maps, sets, arrays, and ranges. Includes sorting, filtering, grouping, and transformation examples.

10 Practical Groovy Set Examples for Unique Collections

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Groovy set provides built-in support, shown here with 10 examples. Create unique collections, perform set operations like union and intersection. Tested on Groovy 5.x. “A set is a Many that allows itself to be thought of as a One.” – Georg Cantor Georg Cantor, Mathematician Last Updated: March 2026 | Tested on: Groovy 5.x, Java 17+ | Difficulty: Beginner to Intermediate | Reading Time: 16 minutes If you’ve been calling .unique() on a Groovy List to remove duplicates, you already ... Read More

10 Easy Groovy Array Length and Size Examples Explained

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Get Groovy array length using length, size(), and count(). 10 tested examples covering arrays, lists, maps, and strings on Groovy 5.x. “Knowing how many elements you have is the first step to doing something useful with them.” Edsger Dijkstra, A Discipline of Programming Last Updated: March 2026 | Tested on: Groovy 5.x, Java 17+ | Difficulty: Beginner | Reading Time: 14 minutes Checking how many elements an array or collection contains is one of the most frequent operations in any ... Read More

10 Groovy List Contains and Remove Methods Explained

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Groovy list contains checks are easy -, remove, and deduplicate operations simple with 10 tested examples. Find, remove, and clean list data on Groovy 5.x. “The art of programming is the art of organizing complexity – and lists that contain duplicates and stale entries are complexity waiting to bite you.” Robert C. Martin, Clean Code Last Updated: March 2026 | Tested on: Groovy 5.x, Java 17+ | Difficulty: Beginner to Intermediate | Reading Time: 18 minutes Once you know how ... Read More