Search results
Oct 23, 2020 · This article will discuss some of the most frequently asked questions in JavaScript with the intention of helping readers overcome any confusion they may have around this language. Question What are the states of a promise?
- Manu Bhardwaj
Jan 18, 2024 · Explore JavaScript Promises with exercises on random resolution, chained arithmetic, parallel data fetching, fastest response, and cancellation. Improve your async skills with concise code and clear explanations. Learn effective methods for handling promises, simplifying errors, and creating resilient, maintainable code.
Sep 9, 2024 · 10 Tricky JavaScript Promise Questions You Must Practice Before an Interview. Eishta Mittal. ·. Follow. Published in. Towards Dev. ·. 3 min read. ·. Sep 9, 2024. 4. Before diving into this article, I recommend reading the following foundational pieces to build a solid understanding of JavaScript Promises:
- Can you explain what a Promise is in JavaScript and its states? A Promise in JavaScript is an object representing the eventual completion or failure of an asynchronous operation.
- How do Promises improve readability and maintainability in asynchronous programming? Promises in asynchronous programming enhance readability by providing a clear, linear flow of control.
- Could you clarify the difference between callbacks and Promises in JavaScript? Callbacks and Promises in JavaScript are both techniques for handling asynchronous operations, but they differ significantly.
- How would you handle errors in a Promise-based code? In Promise-based code, errors are handled using the .catch() method. This method is chained at the end of a promise chain and it catches any error that occurs in the preceding promises.
- What Are Promises?
- What Is async/await?
- Conclusion
Promises are one way to handle asynchronous operations in JavaScript. Each promise represents a single operation. It’s made to solve the problem of combining multiple pieces of asynchronous code in a clean way. With promises, we can avoid nesting callbacks too deeply. For example, instead of writing deeply nested callbacks as follows: We write: We ...
async/awaitis a new way to write promise chains in a shorter way. For example, instead of calling the thenfunction with a callback like we had above, we rewrite it to: This is the same as: As we can see, async/await is much shorter than writing thenwith callbacks. We don’t have callbacks and we don’t have to return promises in each callback. readFi...
Promises are a way to chain asynchronous operations cleanly without deeply nested callbacks. We can make them even shorter and cleaner with the async/awaitsyntax.
Sep 3, 2023 · Discover 20 JavaScript Promise interview questions and review sample answers that can help you prepare your own effective responses for your next interview.
People also ask
What are JavaScript promises?
How do you answer a promise interview?
How to create a custom promise in JavaScript?
What is promise chaining in JavaScript?
What is the difference between a callback and a promise in JavaScript?
What is a promise in programming?
Oct 27, 2022 · 15 Tricky JavaScript Promise Questions You Must Practice Before an Interview. Eishta Mittal. ·. Follow. Published in. Towards Dev. ·. 3 min read. ·. Oct 27, 2022. 335. 4. Before diving into this article, I recommend reading the following foundational pieces to build a solid understanding of JavaScript Promises:
