Overview
ErrorOr is a Dart package that provides a type-safe way to handle operations that may succeed with a value of type T or fail with an error of type Object. It encapsulates either a successful result or an error, helping developers avoid null safety issues and improve code clarity when dealing with asynchronous or potentially failing operations. By using ErrorOr, you can explicitly model outcomes without relying on exceptions for control flow, promoting more predictable and maintainable code. The package is lightweight and integrates seamlessly into existing Dart projects.
Use cases
- Handling API responses with success or error states
- Managing async operations that might fail
- Replacing nullable types with explicit error handling
- Improving testability of error-prone functions
- Simplifying state management in UI layers
Key features
- Type-safe success or error wrapping
- No reliance on exceptions for control flow
- Supports null safety
- Minimal boilerplate
- Easy integration with existing Dart code
Suitable for
- Developers seeking explicit error handling
- Projects using functional-style error management
- Teams adopting clean architecture patterns
- Flutter apps needing robust state handling
- Dart libraries exposing reliable APIs
Considerations
- Not suitable for exception-based error propagation
- Requires manual handling of ErrorOr values
- May increase verbosity in simple cases
- Limited to Object-type errors
- Best used in conjunction with other error-handling strategies