CODEWITHSUNDEEP
javascript
ekjcfn3902039
ekjcfn3902039

Reputation: 1839

Javascript async/await callback function

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?

Upvotes: 1

Views: 100

Answers (1)

Ben Aston
Ben Aston

Reputation: 55729

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.

Upvotes: 2

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