async

Module description

Asynchronous programming is a core concept in JavaScript and is very important for a front-end developer for the following reasons:

1. Non-Blocking Code: JavaScript is a single-threaded language, meaning it can only execute one operation at a time. Asynchronous programming allows tasks like API calls or reading/writing local files to be initiated and then set aside until completion, allowing other operations to be executed in the meantime. This non-blocking nature of async code prevents applications from freezing while waiting for a task to complete.

2. Better Performance: By allowing multiple operations to be performed concurrently, asynchronous programming can greatly improve the overall performance and responsiveness of a web application.

3. Real-World Usage: Many real-world tasks in web development, like fetching data from a server, dealing with user input, or waiting for files to load, are done asynchronously. Hence, understanding async programming is crucial to handle such situations effectively.

4. Modern JS APIs: Many modern JavaScript APIs use promises or async/await for managing asynchronous tasks, so understanding these concepts is necessary to use these APIs effectively.

5. Error Handling: Asynchronous programming provides robust ways to handle errors and exceptions that may occur during the execution of asynchronous tasks.

6. Improved User Experience: Asynchronous programming allows programs to remain responsive even while performing lengthy tasks, leading to a smoother and more responsive user experience.

In conclusion, learning asynchronous programming is an essential part of mastering JavaScript and developing effective, performant frontend applications.

Education materials

Promises:

• Promises, async/await
• JavaScript Promises - Introduction
• JavaScript Promises - Basics
• Promises Chaining

Error Handling: - Error Handling - Promises Error Handling

Timers:

• Scheduling: setTimeout and setInterval

Optional materials

• To Read:

  • How Promises Work in JavaScript
  • Synchronous vs Asynchronous JavaScript
  • Using the Fetch API
  • How to Learn JavaScript Promises and Async/Await in 20 Minutes

• To Watch:

  • Learn Callbacks, Promises, Async/Await By Making Ice Cream

• Tools:

  • Loupe
  • JavaScript Visualizer 9000