ECMAScript standard

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ECMAScript is a scripting programming language, standardized by Ecma International in the ECMA-262 specification.


Edition Date published Differences to the previous edition
1 June 1997 First edition, editor Guy L. Steele, Jr.
2 June 1998 Editorial changes to keep the specification fully aligned with ISO/IEC 16262 international standard; editor Mike Cowlishaw.
3 December 1999 Added regular expressions, better string handling, new control statements, try/catch exception handling, tighter definition of errors, formatting for numeric output and other enhancements; editor Mike Cowlishaw.
4 Abandoned Rejected for proposing too much new syntax and too many extra features.
5 December 2009 Added JSON library, use strict mode, property accessors, immutable objects, additional reflection facilities, and more.
5.1 June 2011 Corrected errors in the specification.