Introduction

Async Functions1 is a new feature implemented in ES2017 to handle promises.

Syntax

Fulfilling a promise

async function asyncFunc() {
  return 123;
}
 
asyncFunc().then((x) => console.log(x));
// 123

Rejecting a promise

async function asyncFunc() {
  throw new Error("Problem!");
}
 
asyncFunc().catch((err) => console.log(err));
// Error: Problem!

Footnotes

Footnotes

  1. https://github.com/tc39/ecmascript-asyncawait