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g2701_2800.s2723_add_two_promises.readme.md Maven / Gradle / Ivy

2723\. Add Two Promises

Easy

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.

**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.

**Constraints:**

*   `promise1 and promise2 are promises that resolve with a number`