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

Links

• https://twitter.com/wesbos/status/1181584047144878080

https://twitter.com/wesbos/status/1238472679893671938

https://twitter.com/wesbos/status/1230515254687301635

Regex101

Regexr

https://developer.mozilla.org/en-US/docs/Web/API/Navigator/canShare

Sketch

CloudApp

Figma

https://nodejs.org/api/async_hooks.html

Gulp

https://v8.dev/features/top-level-await

https://github.com/tc39/proposal-pipeline-operator

××× SIIIIICK ××× PIIIICKS ×××

• Scott: Sapper

Wes: Dewalt Oscillating Multitool

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