To test if something is Async or not

AsyncTest.js

// CREDIT: https://stackoverflow.com/questions/33289726/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")
})()