Hasty Treat - Seven Interesting JavaScript Proposals - Async Do, JSON Modules, Immutable Array Methods, and More!

June 28, 2021, 1 p.m. (1 year, 5 months ago)
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In this Hasty Treat, Scott and Wes talk about seven new JavaScript proposals — what they do, where they’re at, and how you might use them.

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Show Notes

03:32 - Seven new JavaScript proposals

06:25 - JSON Modules

09:55 - Array Find From Last

11:40 - Async Do

  • https://github.com/tc39/proposal-async-do-expressions
  • Async do will allow you to group together a block of code and mark it as async.
  • No need for an iife
  • Downside to this is that it’s a code block, so if you need to return any values, you’ll need to jump that up a scope level.
 Promise.all([   async do {     let result = await fetch('thing A');     await result.json();   },   async do {     let result = await fetch('thing B');     await result.json();   }, ]).then(([a, b]) => console.log([a, b]));  

14:33 - Change Array By Copy

17:48 - Temporal

18:35 - As Patterns

20:47 - Pattern Matching

    {props => match (props) {     when ({ loading }) { ; }     when ({ error }) { ; }     when ({ data }) { ; }   }}   

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