EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·Sep 2·5 min read
Dependent if expressions without dependent types
TL;DR
A clever technique allows for dependent if expressions in Haskell without needing dependent types, using only the RebindableSyntax extension. This method enhances type flexibility in functional programming.
✦ Why It Matters
Explore this technique to enhance type flexibility in your Haskell projects today.
Key Takeaways
- Utilize Church encoding to represent boolean values as functions.
- Enable RebindableSyntax to redefine if expressions in Haskell.
- Remove restrictive type signatures for more flexible type inference.
- Implement dependent if expressions to return different types safely.
How It Works
The technique involves using Church-encoded booleans, which are functions that take two arguments and return one based on the boolean value. By defining an 'ifThenElse' function that operates on these Church-encoded booleans, the author demonstrates how to create conditional expressions that can return different types.
Removing type signatures allows the Haskell compiler to infer more general types, enabling the implementation of dependent if expressions without the need for complex type systems.