Async / Await: Cannot access variable before initialization (javscript)

Question

When I run the code below I get the following error:

ReferenceError: Cannot access 'bar' before initialization.

Could someone help me understand why this is happening? As far as I can tell, the foo function should wait until the promise resolves (since I'm using await before moving onto the console.log(bar) line. What am I missing here?

function qux() {
  return Math.random();
}

async function bar() {
  let result = await qux();
  return result > 0.5;
}

async function foo() {
  let bar = await bar();
  console.log(bar);
}

foo();

The use of `async` and `await` here is incongruous when all you have is synchronous code. — jfriend00, Nov 21 '21 at 05:33

score 7 · Accepted Answer · edited Nov 21 '21 at 05:11

7

The problem is in the function foo()

bar is already a function and you're trying to assign to it while calling it, which probably isn't what you meant to do.

Change the name of one of them.

function qux() {
  return Math.random();
}

async function bar() {
  let result = await qux();
  return result > 0.5;
}

async function foo() {
  let x = await bar();
  console.log(x);
}

foo();

edited Nov 21 '21 at 05:11

Andy

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answered Nov 21 '21 at 05:00

DexieTheSheep

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1

Ahh, yep you're right — thanks! – bugsyb Nov 21 '21 at 20:13

Async / Await: Cannot access variable before initialization (javscript)

1 Answers1