sleep() equivalent for vanilla Javascript using ES6 features

sleep-es6.js

// sleep() equivalent for vanilla Javascript using ES6 features
// created by  Dan Dascalescu 
// see https://stackoverflow.com/questions/951021/what-is-the-javascript-version-of-sleep/39914235#39914235

function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
}

async function demo() {
    console.log('Taking a break...');
    await sleep(2000);
    console.log('Two seconds later, showing sleep in a loop...');

    // Sleep in loop
    for (let i = 0; i < 5; i++) {
        if (i === 3)
          await sleep(2000);
        console.log(i);
    }
}

demo();