async/await concurrent function calls in javascript (Chain functions)

Question

I think I'm probably misunderstanding how to use async/await, but I'm struggling to find a solution that doesn't dive into promises.

I have an if statement that contains two functions. I need functionTwo to run only after functionOne has completed. adding async and await before them doesn't seem to work, but I don't think I'm a million miles away.

Any help would be great! Thank you!

if (someBoolean) {
  functionOne();
  functionTwo();
}

if (someBoolean) {
  async functionOne();
  await functionTwo();
}

Jamiec · Accepted Answer · 2019-10-31 15:37:52Z

4

You use await for both.

if (someBoolean) {
  await functionOne();
  await functionTwo();
}

async is used when you declare the functions

async function functionOne() {... }

answered Oct 31, 2019 at 15:37

Jamiec

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2 Comments

Nick Over a year ago

Currently getting an error - Can not use keyword 'await' outside an async function. That might be related to my app?

Gibor Over a year ago

@Nick You have to declare the function that this if statement is inside as async. e.g- function func() { if(someBoolen) { await func1; await func2; } }. The async keyword basiclly says this function is going to have some async operation inside, and then the await comes before that async operation and waits for it to finish before it continues the async function.

Gerard · Accepted Answer · 2019-10-31 15:42:47Z

0

async/await uses Promises! So I think that's not the best way to go if you want to avoid Promises. Your best bet might be to include a callback in your first function.

function one(callback) {
  /* do your stuff here */
  if (typeof callback === 'function) {
    callback()
  }
}

function two() {/* do the second set of things here */}

if (someBoolean) {
  one(two)
}

answered Oct 31, 2019 at 15:42

Gerard

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