1. Basics of Asynchronous Programming

• What is Asynchronous Programming?
  • Synchronous vs. Asynchronous.
  • Blocking vs. Non-blocking code.
• Single-threaded Event Loop
  • How JavaScript handles asynchronous tasks.
  • Call Stack, Event Loop, Task Queue, and Microtask Queue.

2. Asynchronous Patterns

• Callbacks
  • Callback Hell and its drawbacks.
• Promises
  • Creating Promises.
  • .then() and .catch().
  • Promise chaining.
  • .finally() method.

3. Advanced Promise Patterns

• Promise.all, Promise.race, Promise.any, and Promise.allSettled
  • Handling multiple promises in parallel or selectively.
• Custom Promise Utilities
  • Implementing your own Promise.all or Promise.race.

4. Async/Await

• Introduction to Async/Await
  • Replacing .then() and .catch() with cleaner syntax.
• Error Handling with try/catch
  • Graceful handling of rejections.
• Combining Async/Await with Promises

5. Event loop and Microtasks

• Event Loop Mechanics
  • Role of the event loop in asynchronous programming.
• Task Queue (Macrotasks)
  • setTimeout, setInterval, setImmediate (Node.js).
• Microtask Queue
  • Promises and process.nextTick() (Node.js).