Web Reference: Dec 9, 2025 · Browser Set -like objects (or "setlike objects") are Web API interfaces that behave in many ways like a Set. Just like Set, elements can be iterated in the same order that they were added to the object. Set -like objects and Set also have properties and methods that share the same name and behavior. The primary feature of Set objects is that they only store unique values. If an attempt is made to add an element that already exists in the set, the add() method will have no effect, and the set will remain unchanged. Sep 5, 2017 · JavaScript’s Set object comes with several built-in methods to add, remove, check, and iterate over values. Below are the most commonly used methods with syntax and examples.
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