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Asynchronous programming is an essential part of modern web development. It allows us to perform tasks concurrently, improving the performance and user experience of our applications. One powerful tool that makes async programming possible in JavaScript is Promises.
This article will explore what Promises are, why they matter, and how you can use them effectively in your own projects.
What Are Promises?
In JavaScript, a Promise represents a value that may not be available yet but will be resolved at some point in the future. A Promise has three states:
- Pending: The initial state; neither fulfilled nor rejected.
- Fulfilled: When the operation was successful, resulting in a return value.
- Rejected: When the operation failed, providing an error message or object.
A Promise is created using the Promise
constructor, which takes a single argument—a function called the executor. This executor receives two parameters: resolve
and reject
…