2723-add-two-promises

2723. Add Two Promises (Easy) (https://leetcode.com/problems/add-two-promises/)

Given two promises promise1 and promise2, return a new promise. promise1 and promise2 will both resolve with a number. The returned promise should resolve with the sum of the two numbers. Constraints: - promise1 and promise2 are promises that resolve with a number

Example 1:
 
    Input:
    promise1 = new Promise(resolve => setTimeout(() => resolve(2), 20)),
    promise2 = new Promise(resolve => setTimeout(() => resolve(5), 60))
    Output: 7
    Explanation:
    The two input promises resolve with the values of 2 and 5 respectively.
    The returned promise should resolve with a value of 2 + 5 = 7.
    The time the returned promise resolves is not judged for this problem.
 
  Example 2:
 
    Input:
    promise1 = new Promise(resolve => setTimeout(() => resolve(10), 50)),
    promise2 = new Promise(resolve => setTimeout(() => resolve(-12), 30))
    Output: -2
    Explanation:
    The two input promises resolve with the values of 10 and -12 respectively.
    The returned promise should resolve with a value of 10 + -12 = -2.