flutter-handling-concurrency

Run heavy computations in Flutter without freezing the UI by offloading tasks to background isolates using `Isolate.run()`. This prevents the main thread from blocking and maintains smooth animations and user interactions.

Async/await manages I/O-bound operations concurrently on the main thread, while isolates execute short-lived heavy computations or long-lived background processing in separate memory heaps to ensure non-blocking UI updates.

Pass messages between a background isolate and the main thread in Flutter using `Isolate.spawn()` with `ReceivePort` and `SendPort`. This enables efficient long-lived background task execution and non-blocking UI updates.

Use `Isolate.run()` for short-lived heavy computations that return a single result, and use `Isolate.spawn()` with `ReceivePort` for long-lived background processing that requires continuous message passing to maintain UI responsiveness.

Parsing large JSON files in Flutter blocks the user interface if done on the main thread. Offload complex data transformations to a background isolate using this approach so the user can continue interacting with the app.