Web Reference: Dec 9, 2025 · Set objects are collections of values. A value in the set may only occur once; it is unique in the set's collection. You can iterate through the elements of a set in insertion order. A JavaScript Set is a collection of unique values. Each value can only occur once in a Set. The values can be of any type, primitive values or objects. Sep 5, 2017 · A Set in JavaScript is used to store a unique collection of items, meaning no duplicates are allowed. Sets internally use a hash table which makes search, insert and delete operations faster than arrays.
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