New JavaScript Set methods | MDN Blog

New JavaScript Set methods are arriving! Since Firefox 127, these methods are available in most major browser engines, which means you won't need a polyfill to make them work everywhere. This article is a good read for people who are new to Set in JavaScript and are looking to find out how to use these new JavaScript methods. I'll highlight some advantages of using these methods with basic example

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ES2025に入るSet Methodsについて。 Firefox 127で実装されている