How to create a custom Promise in JavaScript
· JavaScript
Learn how to wrap legacy callback APIs and custom logic in Promises for consistent async patterns across your codebase.
Category: JavaScript
80 questions in JavaScript.
What is the difference between microtasks and macrotasks
· JavaScript
Understand the difference between microtasks and macrotasks in JavaScript and how they affect the order of asynchronous execution.
How to handle errors in async JavaScript functions
· JavaScript
Discover robust patterns for catching and handling errors in async functions, Promise chains, and top-level await scenarios.
What is Promise.all and when to use it
· JavaScript
Learn how Promise.all runs multiple Promises concurrently and how it differs from Promise.allSettled and Promise.race.
How to use setTimeout and setInterval in JavaScript
· JavaScript
Learn how to schedule delayed and repeating tasks with setTimeout and setInterval, and how to clear them properly.
What are callbacks in JavaScript and how to avoid callback hell
· JavaScript
Understand JavaScript callbacks, why nested callbacks become unmanageable, and strategies like Promises and async/await to flatten code.
How to use the fetch API in JavaScript
· JavaScript
Learn how to make HTTP requests with the modern fetch API, handling JSON, headers, errors, and request configuration.
How to use async and await in JavaScript
· JavaScript
Master async/await syntax in JavaScript to write asynchronous code that reads like synchronous logic with proper error handling.
How to use Promises in JavaScript
· JavaScript
Learn how to create, chain, and handle Promises in JavaScript for cleaner asynchronous code compared to nested callbacks.
How to throttle and debounce events in JavaScript
· JavaScript
Implement throttle and debounce patterns in JavaScript to control how often event handlers execute for scroll, resize, and input events.