JavaScript Asynchronous Programming

What is Asynchronous Programming?

JavaScript can run tasks asynchronously, meaning it does not wait for a task to finish before moving on.

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Callbacks

A callback is a function that runs after another function finishes.

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Promises

A Promise represents a future value.

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Using then() and catch()

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Async Functions

Async functions always return a Promise.

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Await

The await keyword pauses execution until the Promise resolves.

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Error Handling

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Full Example

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Why Asynchronous Programming is Important

  • Handle API requests
  • Improve performance
  • Prevent blocking UI
  • Used in real applications

Common Mistakes

  • Forgetting await
  • Not using try/catch
  • Mixing callbacks and async incorrectly

Practice

Create a function that returns a Promise and use async/await to print the result.

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