README.md

Summary of JavaScript Concepts Covered in These Exercises

1. Asynchronous Programming:

   • Understanding the differences between synchronous and asynchronous code execution.
   • Working with callbacks and the challenges they present, such as the callback pyramid of doom.

2. Promises:

   • Creating and using Promises in JavaScript.
   • Promise states: pending, fulfilled, and rejected.
   • Consuming promises using then, catch, and finally methods.
   • Chaining multiple promises for sequential execution.
   • Handling errors and understanding how promises handle rejected states.
   • Using Promise-based libraries like Axios.

3. Async/Await:

   • Simplifying asynchronous code using the async and await keywords.
   • Error handling in async functions using try-catch blocks.
   • Using async/await for sequential and parallel API requests.
   • Combining promises and async/await for more complex asynchronous flows.

4. Advanced Promise Methods:

   • Promise.all: Running multiple promises concurrently and waiting for all to complete.
   • Promise.allSettled: Handling all promises and capturing both resolved and rejected outcomes.
   • Promise.any: Returning the first resolved promise and handling multiple sources of data.
   • Promise.race: Handling the first settled promise, whether fulfilled or rejected.

5. HTTP Requests:

   • Making HTTP requests using XMLHttpRequest and Fetch API.
   • Handling and configuring HTTP headers and status codes.
   • Using AbortController to cancel requests.
   • Understanding CORS and preflight requests.

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