JavaScript Async Adventures-JavaScript Asynchronous Guide

Example

fetch('https://api.example.com/data').then(response => response.json()).then(data => console.log(data)).catch(error => console.error('Error:', error));

Scenario

Used when developers need to perform a series of asynchronous operations sequentially, such as processing server responses step-by-step.

Example

new Promise((resolve, reject) => { throw new Error('Failed!'); }).catch(error => console.error(error.message));

Scenario

Critical in any asynchronous operation, allowing developers to catch and manage errors effectively, preventing crashes and unhandled exceptions.

Example

async function fetchData() { try { const response = await fetch('https://api.example.com'); const data = await response.json(); return data; } catch (error) { console.error('Fetch error:', error); } }

Scenario

Facilitates writing asynchronous code in a more readable and structured manner, akin to synchronous code, which is especially useful in complex logic flows.

Example

const readFilePromise = filename => new Promise((resolve, reject) => { fs.readFile(filename, (err, data) => { if (err) reject(err); else resolve(data); }); });

Scenario

Helps in refactoring older callback-based code to promises, improving code readability and error handling.