ECMA-262 is managed and evolved by Ecma’s Technical Committee 39 (TC39). Its members are companies such as Microsoft, Mozilla, and Google, which appoint employees to participate in committee work; examples include Brendan Eich, Allen Wirfs-Brock (editor of ECMA-262), and David Herman. To advance the design of ECMAScript, TC39 hosts discussions on open channels (such as the mailing list es-discuss) and holds regular meetings. The meetings are attended by TC39 members and invited experts. In early 2013, attendee numbers ranged from 15 to 25.
The following is a list of ECMAScript versions (or editions of ECMA-262) and their key features:
do-while, regular expressions, new string methods (
splitwith a regular expression, etc.), exception handling, and more
Thus, the ECMAScript 4 developers agreed to make Harmony less radical than ECMAScript 4, and the rest of TC39 agreed to keep moving things forward.