EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·Aug 26·5 min read
The ReaderT Design Pattern (2017)
TL;DR
The ReaderT pattern in Haskell provides a structured way to manage dependencies in functional programming. It leverages Haskell's features to enhance code organization and clarity.
✦ Why It Matters
Consider implementing the ReaderT pattern in your Haskell projects to improve code clarity and manage dependencies effectively.
Key Takeaways
- Define a core Env data type for configuration management.
- Use ReaderT to structure your application code effectively.
- Avoid global variables by threading configuration through your application.
- Consider typeclasses to reduce coupling and improve testability.
How It Works
The ReaderT design pattern allows developers to pass an immutable environment (Env) containing configuration and functions throughout the application. This is achieved by defining the application type as ReaderT Env IO, which simplifies dependency management and enhances code clarity.
Mutable state can be included in Env as needed, but the overall structure remains focused on immutability, reducing complexity and potential errors.