How do you handle a promise in JavaScript?

Table of Contents

• Introduction
• Handling Promises
  • 1. Using .then() and .catch()
    • Syntax
    • Example
  • 2. Chaining Promises
  • 3. Using async/await
    • Example
  • Explanation:
• Conclusion

Introduction

Handling promises in JavaScript is essential for managing asynchronous operations, allowing developers to write cleaner and more maintainable code. This guide explores the various ways to handle promises, including the use of .then(), .catch(), and the async/await syntax.

Handling Promises

1. Using .then() and .catch()

The most common way to handle promises is through the .then() and .catch() methods.

Syntax

• .then(onFulfilled) is executed when the promise is resolved.
• .catch(onRejected) is executed when the promise is rejected.

Example

2. Chaining Promises

You can chain multiple .then() calls to handle sequential asynchronous operations:

3. Using async/await

The async/await syntax provides a more synchronous-looking way to handle promises, making the code easier to read and maintain.

Example

Explanation:

• async before a function declaration allows the use of await within that function.
• await pauses the execution of the function until the promise is resolved or rejected.

Conclusion

Handling promises in JavaScript can be effectively achieved through methods like .then(), .catch(), and the more modern async/await syntax. Understanding these approaches allows developers to manage asynchronous operations cleanly and efficiently, ultimately leading to better code quality and readability.