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5[edit]

mainly used

wikipedia:ECMAScript#5th_Edition

ECMAScript 6[edit]

wikipedia:ECMAScript#6th_Edition_-_ECMAScript_2015 adds significant new syntax for writing complex applications, including classes and modules, but defines them semantically in the same terms as ECMAScript 5 strict mode. Other new features include iterators and for/of loops, Python-style generators and generator expressions, arrow functions, binary data, typed arrays, collections (maps, sets and weak maps), promises, number and math enhancements, reflection, and proxies

http://es6-features.org/


es6 in browsers

http://exploringjs.com/es6/ch_modules.html

bad in mobile browsers, absent in iOS7, iOS8, but may be presented as #5 with #es6-shim addon

es6-shim[edit]

used in Category:Angular#2