- There are many variants
- ES5, ES6, then ES7 (ES2016) TypeScript, AtScript, Dart, CoffeeScript, ...
- ES6 and ES7 come with a set of new language features
- Today, however, ES5 is still the version that is most widely supported by browsers
- TypeScript is superset of ES5, ES6, ES7
- TypeScript code gets transpiled into ES5 code for execution in browsers
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