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
– CertainPerformance, Commented Dec 17, 2019 at 22:20
Agreed, the second snippet throws a syntax error just as the first one does. — Patrick Roberts
– Patrick Roberts, Commented Dec 17, 2019 at 22:20
bunch of useful comments about the syntax differences in here stackoverflow.com/questions/42964102/… — Nikki9696
– Nikki9696, Commented Dec 17, 2019 at 22:23

Edouard LAURET · Accepted Answer · 2019-12-17 22:23:08Z

2

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, 2019 at 22:23

Edouard LAURET

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Comments

CS QGB · Accepted Answer · 2019-12-17 23:02:21Z

1

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

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

answered Dec 17, 2019 at 23:02

CS QGB

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