LeetCode //2723. Add Two Promises (Day 30 of LC JavaScript Challenage)-Toy模板网

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2723. 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.

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

From: LeetCode
Link: 2723. Add Two Promises
文章来源地址https://www.toymoban.com/news/detail-502099.html

Solution:

Ideas：

This function takes two promises as input, and returns a new promise that resolves with the sum of the two numbers. The function works by first chaining the two promises together. This means that when the first promise resolves, the second promise will be executed. Once the second promise resolves, the sum of the two numbers will be calculated and the new promise will be resolved.

Code:

/**
 * @param {Promise} promise1
 * @param {Promise} promise2
 * @return {Promise}
 */
var addTwoPromises = async function(promise1, promise2) {
    return new Promise((resolve, reject) => {
        promise1.then((num1) => {
            promise2.then((num2) => {
                resolve(num1 + num2);
            });
        });
    });   
};

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