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