Web Reference: Learn JavaScript Set from scratch. Covers creating sets, set methods like has (), delete (), size, iterating sets, converting set to array, forEach, and WeakSet with easy examples. 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. 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.
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