Browsers and Node.js add more functionality through additional objects and methods, but the core of the language remains as defined in ECMAScript. What you know as JavaScript in browsers and Node.js is actually a superset of ECMAScript. The language defined in this standard is called ECMAScript. The JavaScript core language features are defined in a standard called ECMA-262. Appendix B: Understanding ECMAScript 7 (2016).Function Proxies with the apply and construct Traps.Preventing Property Deletion with the deleteProperty Trap.Hiding Property Existence Using the has Trap.Object Shape Validation Using the get Trap.Validating Properties Using the set Trap.Differences Between Typed and Regular Arrays.Similarities Between Typed and Regular Arrays.The Spread Operator and Non-Array Iterables.Exposing Internal Operations with Well-Known Symbols.Clarifying the Dual Purpose of Functions.Increased Capabilities of the Function Constructor.Functions with Default Parameter Values.

Emerging Best Practices for Block Bindings.

Ecmascript 7