What are Dispatchers and name all of them?

Answer

Dispatchers determine which thread or thread pool a coroutine runs on.

1. Dispatchers.Main

   • Thread: The main (UI) thread.
   • Use for: UI updates, handling user interactions.

2. Dispatchers.IO

   • Thread: A shared pool of on-demand threads (64 or more).
   • Use for: Blocking I/O operations (Network, Database, File reading/writing).

3. Dispatchers.Default

   • Thread: A shared pool of threads optimized for CPU work (size = number of CPU cores).
   • Use for: CPU-intensive tasks (Sorting lists, parsing JSON, complex calculations).

4. Dispatchers.Unconfined

   • Thread: Starts in the current thread, but resumes in whatever thread the suspending function finished on.
   • Use for: Testing or very specific edge cases. rarely used in general app code.