Javascript async/await callback function

Question

I'm wondering if async/await behave the same in the following two 'super-basic' examples:

async function blah1() {
  return await foo.bar().then('Done');
}

as this

async function blah2() {
  return blah3(foo.bar());
}

async function blah3(fn) {
  return await fn.then('Done');
}

or is there some important difference?

• Yes I know 'return await' is redundant but I left it in for this example :)

Answer 1

async function blah1() {
  return await foo.bar().then('Done');
}

blah1()

Calls foo.bar , which returns a promise, to which a then is added.

The resultant promise is returned.

async function blah2() {
  return blah3(foo.bar());
}

async function blah3(fn) {
  return await fn.then('Done');
}

blah2()

Calls foo.bar , which returns a promise, which is passed to blah3 , which adds a then .

The resultant promise is returned from blah3 to blah2 and thence to the caller.

I'd say no meaningful behavioral difference.