ES 2020 news
What is ECMAScript?
ES2020
BigInt
new primitive to work with large numbers
Nullish operator
replacement for || operator
Optional chaining
no more pain with a.b.c!
Dynamic Imports
So async. Much modules. Wow
Promise.allSettled
like .all but no :)
globalThis
Unified link to global object for browsers/node.js/workers
String.prototype.matchAll()
New method to work with RegExp's
Proposals that most likely we will see next year
Numeric Literals
0x1F + 9 + 0b10 = 42
Class Fields
Finally!
Private Class Fields
#FINALLY!
WeakRef & FinalizationGroups
new way to shoot in leg🔫🔫🔫
Last years recap
ES2018 & 2019
ES2018
-
RegExp improvements :
- Named groups
- dotAll flag
- Unicode aware regexp
- look behind assertions
- Async Iteration
- Promise.finally()
- Rest/Spread properties
ES2019
- Object.fromEntries()
- String.prototype.trimStart()/trimEnd()
- Array.prototype.flat()/flatMap()
- Symbol.prototype.description
- Function.prototype.toString() revision
Browser compatibility list
| Feature: | Chrome | Safari | Firefox | Edge | Opera | Node.js | Babel |
|---|---|---|---|---|---|---|---|
| Class fields | 72 | - | 69 | - | 60 | 12.0.0 | + |
| Private Class Fields | 74 | - | - | - | 62 | 12.0.0 | + |
| Weak Ref | - | - | - | - | - | - | - |
| Numeric Literals | 75 | - | 70 | 44 | 62 | 12.5.0 | + |
| BigInt | 67 | - | 68 | - | 54 | 10.4.0 | + |
| Dynamic Import | 80 | 11.1* | 67 | - | 50 | 12.0.0* | + |
| Promise .allSeteled | 76 | 13 | 71 | - | 67 | 12.9.0 | + |
| Nullish Operator | 80 | - | 72 | - | - | - | + |
| Optional Chain Operator | 80 | - | 74 | - | 67 | - | + |
| String.prototype.matchAll | 73 | - | 67 | - | 60 | 12.0.0 | + |
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