Posted on Aug 3, 2023

Day 18: Timeout

Question

Write a function promiseTimeout that takes an asynchronous operation represented as a Promise and rejects it after a specific time if it hasn't been resolved yet.

function promiseTimeout(promise, timeout) { // Todo add your code } // Simulating an asynchronous operation  const delayBy2000 = new Promise((resolve, reject) => { setTimeout(() => { resolve({ name: 'John Doe', age: 30 }); }, 2000); // Resolves after 2 seconds }); const timeout = 1500; // Set timeout for 1.5 seconds const promiseWithTimeout = promiseTimeout(delayBy2000, timeout); promiseWithTimeout .then((data) => { console.log('Promise resolved:', data); }) .catch((error) => { console.error('Promise rejected:', error.message); });

🤫 Check the comment below to see answer.

Top comments (1)

Dharan Ganesan • Aug 2 '23 • Edited

There are multiple way to answer this

First answer:

function promiseWithTimeout(promise, timeout) { return new Promise((resolve, reject) => { // Start the original promise promise.then(resolve).catch(reject); // Set a timeout to reject the promise if it hasn't resolved within the specified time setTimeout(() => { reject(new Error(`Promise timed out after ${timeout} milliseconds`)); }, timeout); }); }

Second answer:

function promiseWithTimeout(promise, timeout) { // Create a new Promise that resolves when the input promise resolves const resolvedPromise = new Promise((resolve, reject) => { promise.then(resolve).catch(reject); }); // Create a Promise that rejects after the specified timeout const timeoutPromise = new Promise((resolve, reject) => { setTimeout(() => { reject(new Error('Promise timeout')); }, timeout); }); // Use Promise.race() to wait for either the input promise or the timeout to settle return Promise.race([resolvedPromise, timeoutPromise]); }