🔗LC2621 🟢 Easy 🧩 Pattern – Promises and Time
📅 Day 13/30 Days of JavaScript
Given a positive integer millis, write an asynchronous function that sleeps for millis milliseconds. It can resolve any value.
Example
Input: millis = 100
Output: 100
Explanation: It should return a promise that resolves after 100ms.
let t = Date.now();
sleep(100).then(() => {
console.log(Date.now() - t); // 100
});Solution
The promise will wait until the setTimeout completes and calls the resolve method, and the setTimeout of course waits/sleeps for millis provided.
/**
* @param {number} millis
* @return {Promise}
*/
async function sleep(millis) {
return new Promise((resolve) => setTimeout(resolve, millis))
}
/**
* let t = Date.now()
* sleep(100).then(() => console.log(Date.now() - t)) // 100
*/