ECMAScript 2023 adds new methods for searching and changing arrays, allows symbols to be used as WeakMap keys, and standardizes support for hashbang grammar.

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ECMAScript 2023 spec for the JavaScript programming language has been approved by ECMA International. The new spec adds two methods for arrays, extends the WeakMap API to allow unique symbols, and introduces some standardization for the use of hashbangs.

ECMAScript 2023 spec for JavaScript finalized