Read Understanding ECMAScript 6 | Leanpub

Introduction The JavaScript core language features are defined in a standard called ECMA-262. The language defined in this standard is called ECMAScript. What you know as JavaScript in browsers and Node.js is actually a superset of ECMAScript. Browsers and Node.js add more functionality through additional objects and methods, but the core of the language remains as defined in ECMAScript. The ongoi

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