_2723. Add Two Promises.md

2723. Add Two Promises

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First completed : July 09, 2024

Last updated : July 09, 2024

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Related Topics : N/A

Acceptance Rate : 91.45 %

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Solutions

• e2723 v1.js
• e2723 v2.js
• e2723 v3 reduction promiseall.js

JavaScript

e2723 v1.js

/**
 * @param {Promise} promise1
 * @param {Promise} promise2
 * @return {Promise}
 */
var addTwoPromises = async function(promise1, promise2) {
    return await promise1 + await promise2;
};

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

e2723 v2.js

/**
 * @param {Promise} promise1
 * @param {Promise} promise2
 * @return {Promise}
 */
var addTwoPromises = async function(promise1, promise2) {
    return promise1.then(val1 => promise2.then(val2 => val1 + val2));
};

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

e2723 v3 reduction promiseall.js

/**
 * @param {Promise} promise1
 * @param {Promise} promise2
 * @return {Promise}
 */
var addTwoPromises = async function(promise1, promise2) {
    return (await Promise.all([promise1, promise2])).reduce((rollingSum, x) => rollingSum + x, 0);
};

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