December 1999Added support for regular expressions, improved string handling, new control statements, exception handling, and various numeric output formatting, and more.
December 2009Adds Strict mode, clarifies ambiguities, and implemented accommodations for real-world uses of implementations. Adds getters and setters, support for JSON, and reflection on object properties.
June 2011Release to align with the third edition of the international standard ISO/IEC 16262:2011.
June 2011Significant new syntax for building complex applications, including long-awaited direct language support for classes and modules, as well as numerous other language enhancements.