CODEWITHSUNDEEP
javascriptasync-await
psyanite
psyanite

Reputation: 99

Using await as an argument

Just wondering if this is do-able (I assume not because I have never seen it done anywhere) and if anyone has a good explanation as to why not.

const expiry = new Date(await getTokenExpiry() * 1000)

Or whether I have to do it like this:

const expiry = await getTokenExpiry()
const muhExpiry = new Date(expiry * 1000)

Thank you for reading my question.

Upvotes: 0

Views: 64

Answers (1)

CertainPerformance
CertainPerformance

Reputation: 370679

Yes, it can be done - arguments are evaluated before their outer expressions, after all, which goes hand-in-hand with await, should you need it. For example:

const multiplyBy4 = num => num * 4;
const resolveWithOne = () => new Promise(res => setTimeout(res, 500, 1));

(async () => {
  console.log('start');
  const result = multiplyBy4(await resolveWithOne());
  console.log(result);
})();

That said, unless the expression is quite trivial, code would probably be a bit more readable if you put each await on its own line.

Upvotes: 3

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