ECMAScript 2018 (ES9) is the 9th edition of the ECMAScript Language Specification

• https://262.ecma-international.org/9.0/

• http://www.ecma-international.org/ecma-262/9.0/index.html

• https://en.wikipedia.org/wiki/ECMAScript#ES2018

• https://exploringjs.com/es2018-es2019/

• https://flaviocopes.com/es2018/

https://github.com/tc39/proposals/blob/master/finished-proposals.md

• https://github.com/tc39/proposal-template-literal-revision

• https://github.com/tc39/proposal-object-rest-spread

• https://github.com/tc39/proposal-regexp-dotall-flag

• https://github.com/tc39/proposal-regexp-named-groups

• https://github.com/tc39/proposal-regexp-lookbehind

• https://github.com/tc39/proposal-regexp-unicode-property-escapes

• https://github.com/tc39/proposal-promise-finally

• https://github.com/tc39/proposal-async-iteration

Description

The 9th edition, officially known as ECMAScript 2018 , was finalized in June 2018.

New features include rest/spread operators for variables (three dots: …identifier), asynchronous iteration, Promise.prototype.finally() and additions to RegExp.

Added

• async-iteration Rest/Spread Properties for ECMAScript (https://github.com/tc39/proposal-async-iteration)
• object-rest-spread Rest/Spread Properties for ECMAScript (https://github.com/tc39/proposal-object-rest-spread)