JavaScript Sets
JavaScript Sets are a built-in collection object introduced in ES6 that store unique values of any type, including primitives and object references. They provide efficient methods for adding, deleting, and checking membership, with values iterating in insertion order. Sets are particularly useful for eliminating duplicates from arrays and performing mathematical set operations like unions and intersections.
Developers should use JavaScript Sets when they need to ensure uniqueness in a collection, such as removing duplicate items from an array or tracking unique user IDs in an application. They are ideal for scenarios requiring fast membership tests (O(1) average time complexity) and set-based operations, making them more efficient than arrays for these tasks in performance-critical code.