BLoC library

Last updated Jun 23, 2022

• Type atom
• Status needs revision
• On flutter

• Stands for Business Logic Component.

• The Best Flutter Bloc Complete Course - Visualise, Understand, Learn & Practice Bloc Concepts - YouTube
• Why We Use flutter_bloc for State Management (verygood.ventures)

The Bloc library provides very good tooling and compared to other state management solutions that use Streams, it’s a pure gem.

• Reactive out of the box
  • Bloc is a subclass of Stream, so you know it integrates nicely with just about anything you throw at it without any complications. Examples include:
    • map a Firestore real-time Stream of data into a Stream of states.
    • Apply RxDart operators on Stream<State> and Stream<Event>. For example, debounceTime is useful for auto-search where you want to start searching for a query only after the user has stopped typing for a while.

• Good tooling for  VS Code and  IntelliJ/Android Studio

• Analytics without any additional work

  • With the help of the BlocDelegate, you can know about any action the user takes in any BLoC without cluttering up your codebase with analytics code.

• Testing Streams is easy, testing Blocs is even easier

  • Dart is built with Streams in mind and testing if a particular sequence of states has been emitted is simple with stream matchers.
  • Why would you leave it at just the matchers though when you can use the bloc_test package which, in my opinion, makes tests fun to write?

• BIASED OPINION: The best documentation ever

So, if you want to have the benefits of immutable state, closely work with Streams whether for the purposes of testing or integration with other code, observe state changes happening across the app from a single place ( BlocDelegate ) easily to allow for pain-free analytics and at the same time keep your code as simple as possible, BLoC is truly the best available option out there.