So Good
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```javascript []
/**
 * @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

```
['JavaScript']