Groovy set provides built-in support, shown here with 10 examples. Create unique collections, perform set operations like union and intersection. Tested on Groovy 5.0.6. “A set is a Many that allows itself to be thought of as a One.” – Georg Cantor Last Updated: July 2026 | Tested on: Groovy 5.0.6, 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 understand why sets ... Read More

Get Groovy array length using length, size(), and count(). 10 tested examples covering arrays, lists, maps, and strings on Groovy 5.0.6. “Knowing how many elements you have is the first step to doing something useful with them.” Last Updated: July 2026 | Tested on: Groovy 5.0.6, 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 Groovy program. Input validation, data iteration, ... Read More

Checking whether a Groovy list contains a value, removing elements without hitting the index-versus-value trap, and stripping duplicates: these three jobs come up in nearly every script. This guide works through all of them with 10 tested examples on Groovy 5.0.6. “The art of programming is the art of organizing complexity – and lists that contain duplicates and stale entries are complexity waiting to bite you.” Last Updated: July 2026 | Tested on: Groovy 5.0.6, Java 17+ | Difficulty: Beginner ... Read More