Algorithm
30 Days of JavaScript
Sleep

2621. Sleep

Tags

  • Promises and Time

Link

https://leetcode.com/problems/sleep/description/?envType=study-plan-v2&envId=30-days-of-javascript (opens in a new tab)

Question

Given a positive integer millis, write an asynchronous function that sleeps for millis milliseconds. It can resolve any value.

Example 1:
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
});
Example 2:
Input: millis = 200
Output: 200
Explanation: It should return a promise that resolves after 200ms.
Constraints:
  • 1 <= millis <= 1000

Answer

JavaScript

/**
 * @param {number} millis
 * @return {Promise}
 */
async function sleep(millis) {
  return new Promise((resolve) => {
    setTimeout(resolve, millis);
  });
  // await new Promise((resolve) => setTimeout(resolve, millis));
}
 
/**
 * let t = Date.now()
 * sleep(100).then(() => console.log(Date.now() - t)) // 100
 */
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