async await with setInterval

Question

function first(){   console.log('first') } function second(){   console.log('second') } let interval = async ()=>{   await setInterval(first,2000)   await setInterval(second,2000) } interval(); 

Imagine that I have this code above.

When I run it, first() and second() will be called at the same time; how do I call second() after first)() returns some data, for example, if first() is done, only then call second()?

Because first() in my code will be working with a big amount of data and if this 2 functions will be calling at the same time, it will be hard for the server.

How do I call second() each time when first() will return some data?

Answer 1

As mentioned above setInterval does not play well with promises if you do not stop it. In case you clear the interval you can use it like:

async function waitUntil(condition) {   return await new Promise(resolve => {     const interval = setInterval(() => {       if (condition) {         resolve('foo');         clearInterval(interval);       };     }, 1000);   }); } 

Later you can use it like

const bar = waitUntil(someConditionHere)