Day-11 (2621. Sleep).js

/**
 * @param {number} millis
 */
async function sleep(millis) {
   return new Promise((resolve,reject) => {
    //    setTimeout(() => {
    //        resolve(millis);
    //    }, millis)

        setTimeout(resolve, millis);
   })
}

/** 
 * let t = Date.now()
 * sleep(100).then(() => console.log(Date.now() - t)) // 100
 */