Day 90 of 100daysofcode : Demystifying BLoC and Cubit in Flutter — their core philosophies, use cases, and why your 2025 projects might lean toward one!
BLoC vs. Cubit: The Heart of the Matter
- What is BLoC?
Definition: BLoC (Business Logic Component) is an event-driven state management pattern. It processes incoming events, transforms them through asynchronous logic, and outputs new states.
Use Cases:
- Apps requiring complex event handling (e.g., real-time data streams, multi-step workflows).
- Projects needing traceability for debugging (every state change is tied to a specific event).
- Teams that benefit from strict separation between UI and business logic (event contracts act as clear boundaries).
- What is Cubit?
Definition: Cubit (a lightweight subset of BLoC) is a simpler state management tool. It uses methods to directly emit state changes without events.
Use Cases:
- Apps with straightforward logic (e.g., counters, forms, toggle switches).
- Rapid prototyping or solo projects where minimal boilerplate speeds up development.
- Scenarios where simplicity and readability outweigh the need for event tracking.
When Should You Use Them?
BLoC shines when:
You’re handling async operations like API calls with retries, debouncing, or complex error handling.
Your app’s logic resembles a state machine (e.g., authentication flows, payment gateways).
Debugging requires event-level granularity (e.g., logging every user action).
Cubit thrives when:
You want to ship fast without over-engineering.
Your state changes are linear and predictable (no middleware or event transformations).
You value readability (methods like increment() are self-documenting).
In 2025, Cubit will likely dominate for everyday apps, while BLoC remains the guardian of complex, large-scale systems. Choose tools that match your problem — not trends!
lebanon-mug
