The release of Firefox 127 introduces new JavaScript Set methods, including intersection(), union(), difference(), symmetricDifference(), isSubsetOf(), isSupersetOf(), and isDisjointFrom(), now supported across major browser engines.
JavaScript Sets guarantee uniqueness of each value, making them suitable for creating unique collections. They are faster than Arrays for checking element existence, enhancing performance in applications.
Methods like union() combine Sets without duplicates, while intersection() finds common elements, and symmetricDifference() identifies unique elements between two Sets.
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