js define anonymous async function SyntaxError

Question

async function (){
    // await somthing
}

Uncaught SyntaxError: Unexpected token (

but i can define normal function like

function (){
    // ...
}()

`but i can define normal function like` Nope. `Function statements require a function name`. Did you mean to use an IIFE? — CertainPerformance, Dec 17 '19 at 22:20
Agreed, the second snippet throws a syntax error just as the first one does. — Patrick Roberts, Dec 17 '19 at 22:20
bunch of useful comments about the syntax differences in here https://stackoverflow.com/questions/42964102/syntax-for-async-arrow-function — Nikki9696, Dec 17 '19 at 22:23

score 1 · Answer 1 · answered Dec 17 '19 at 22:23

1

You need a function name for this syntax :

async function functionName(){
    // await somthing
}

You can use this syntax too if you don't want to name it :

async () => {
  //await something
}

answered Dec 17 '19 at 22:23

Edouard LAURET

score 1 · Answer 2 · answered Dec 17 '19 at 23:02

1

define an [anonymous] function and call immediately，parentheses needed

(async function (){
  return 1
}) () // and call it , Promise {<resolved>: 1}

answered Dec 17 '19 at 23:02

CS QGB

2 Answers2