JS 2018

JS Tutorial

JS Version

JS Objects

JS Function

JS Classes

JS Async

JS HTML DOM

JS Browser BOM

JS Web API

JS AJAX

JS JSON

JS vs JQUERY

JS Graphics

ECMAScript 2018

The JavaScript naming convention started with ES1, ES2, ES3, ES5, and ES6.

But, ECMAScript 2016 and 2017 were not called ES7 and ES8.

Since 2016 new versions are named by year (ECMAScript 2016 / 2017 / 2018).

New Features in ECMAScript 2018

  • Asynchronous Iteration.
  • Promise Finally.
  • Object Rest Properties.
  • New RegExp Features.
  • JavaScript Asynchronous Iteration.

Asynchronous iterators and iterables were added in ECMAScript 2018.

With asynchronous iterables, use the await keyword in for/of loops.

Example

for await () {}

JavaScript Promise. finally

ECMAScript 2018 uses the full implementation of the Promise object with Promise.finally:

Example

let myPromise = new Promise();

myPromise.then();

myPromise.catch();

myPromise.finally();

JavaScript Object Rest Properties

ECMAScript 2018 added rest properties.

This enables the user to destruct an object and collect the leftovers onto a new object:

Example

let { x, y, …z } = { x: 1, y: 2, a: 3, b: 4 };

x; // 1

y; // 2

z; // { a: 3, b: 4 }

New JavaScript RegExp Features

ECMAScript 2018 added four new RegExp features:

  • Unicode Property Escapes (\p{…})
  • Lookbehind Assertions (?<= ) and (?<! )
  • Named Capture Groups
  • s (dotAll) Flag.

Notice: ob_end_flush(): failed to send buffer of zlib output compression (1) in /home/u212091429/domains/mydevhelp.com/public_html/wp-includes/functions.php on line 5420

Notice: ob_end_flush(): failed to send buffer of zlib output compression (1) in /home/u212091429/domains/mydevhelp.com/public_html/wp-includes/functions.php on line 5420