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Wes Bos

Wes Bos

Full Stack JavaScript Developer. Creator of really good web development courses. BBQ enthusiast.

Scott Tolinski

Scott Tolinski

Web Developer, Creator of Level Up Tuts, Bboy, Robotops Crew and Youtuber

Playing: 248: What's New in Javascript

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May 13th, 2020

What's New in Javascript

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In this episode of Syntax, Scott and Wes talk about what is new in Javascript — a whole bunch of new stuff that you can use now and in the next sixth months or so.

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Show Notes

ES2019

04:03 - Array.flatMap() 05:30 - Array.flat() 07:37 - Array.fromEntries() 09:50 - String.trimStart() and String.trimEnd() 11:23 - Function.toString() 11:57 - Object Key Order

  1. Integer keys in ascending order (and strings like "1" that parse as ints)
  2. String keys, in insertion order (ES2015 guarantees this and all browsers comply)
  3. Symbol names, in insertion order (ES2015 guarantees this and all browsers comply)

ES2020

14:50 - Big int 18:09 - Nullish coalescing 20:57 - Optional Chaining 24:55 - promise.allSettled 25:33 - Dynamic import 27:14 - string.matchAll(regex) and string.replaceAll 29:30 - globalThis 30:44 - Module Namespace Exports 33:11 - Navigator.share() API 36:34 - Async Hooks 37:39 - Pipline Operator 39:59 - Top Level Await

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