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ECMAScript

The official standardized specification of the {{JavaScript}} language, maintained by {{Ecma International}} as standard ECMA-262 and developed by the {{TC39}} committee.

ECMAScript is the language standard that defines the syntax and semantics underlying JavaScript and its server-side descendants such as Node.js, Deno, and Bun. It is standardized by Ecma International as specification ECMA-262 and evolved by TC39, with internationalization APIs split into the companion ECMA-402 document. The first edition was adopted in June 1997 as a vendor-neutral compromise between Netscape and Microsoft implementations. Edition 3 (1999) added regular expressions, exceptions, and the strict equality operator. Edition 4 was abandoned after a political deadlock and Edition 5 (2009) added strict mode and JSON. Edition 6 (ES2015) was a major modernization introducing let, const, classes, modules, arrow functions, and promises. Since 2015 a new edition has been published each June through a staged proposal process. ECMAScript is weakly and dynamically typed, prototype-based, and intentionally does not define I/O, leaving that to host environments such as browsers and runtimes.

Metadata

Topic

Uncategorized

Confidence

93%

Sources

1 source

Views

Created

June 05, 2026

Community

0 0

Related Knowledge

TC39

related Strength: 70%

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