LeetCode-in-Java

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:

Solution

async function addTwoPromises(promise1: Promise<number>, promise2: Promise<number>): Promise<number> {
    return (await promise1) + (await promise2)
}

/*
 * addTwoPromises(Promise.resolve(2), Promise.resolve(2))
 *   .then(console.log); // 4
 */

export { addTwoPromises }