Combination of async function + await + setTimeout
Since Node 7.6, you can combine the functions promisify
function from the utils module with setTimeout()
.
Node.js
const sleep = require('util').promisify(setTimeout)
Javascript
const sleep = m => new Promise(r => setTimeout(r, m))
Usage
(async () => {
console.time("Slept for")
await sleep(3000)
console.timeEnd("Slept for")
})()
The quick one-liner, inline way
await new Promise(resolve => setTimeout(resolve, 1000));
Your sleep
function does not work because setTimeout
does not (yet?) return a promise that could be await
ed. You will need to promisify it manually:
function timeout(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
async function sleep(fn, ...args) {
await timeout(3000);
return fn(...args);
}
Btw, to slow down your loop you probably don't want to use a sleep
function that takes a callback and defers it like this. I recommend:
while (goOn) {
// other code
var [parents] = await Promise.all([
listFiles(nextPageToken).then(requestParents),
timeout(5000)
]);
// other code
}
which lets the computation of parents
take at least 5 seconds.