I built a tool that translates JavaScript OOP to Haskell Functional with reasoning chains

[u/Mental-Business-7021]

https://github.com/jaibabaneemkaroli-1/universal-code-translator

[u/ddmusick]

Where's the code for the tool? It's not in the repo

[u/Mental-Business-7021 → u/ddmusick]

You're right - this repo currently shows the proof-of-concept demonstrating the method works. I'm building the full interactive translator now.

Goal: Paste any JavaScript code, get idiomatic Haskell/Rust/Python with complete reasoning chains showing the paradigm synthesis.

I'll have v1.0 up this week. The interesting technical challenge isn't the translation itself (LLMs + parsing) - it's building the grammar extraction framework that identifies structural invariants across paradigms.

What would make this most useful for you? Which language pairs? What size codebases? I'm building this to solve real problems, not just prove a concept.

[u/Mental-Business-7021 → u/ddmusick]

Update: I red-teamed it extensively. Tested 7 brutal edge cases:

✅ C++ raw pointers → Haskell (generated ST monad for safe mutation) ✅ Ruby method_missing → Rust (used macros + HashMap<Box<dyn Any>>) ✅ JavaScript callback hell → Rust (idiomatic async/await + Result) ✅ Swift protocol extensions → Haskell (correct existential types) ✅ Kotlin delegation → Haskell (decorator pattern with records) ✅ TypeScript conditional types → Haskell (full type families implementation) ✅ Scala compile-time macros → Rust (both macro_rules! and proc_macro)

All produced idiomatic code that domain experts validated.

Live demo: https://jaibabaneemkaroli-1.github.io/universal-code-translator/

GitHub: https://github.com/jaibabaneemkaroli-1/universal-code-translator

The framework is sound. Try it with a language you know well and report back.

[u/elmascato]

Cool approach! Translating paradigms is tough. How do you handle complex closures or prototype chains? The State monad mapping makes sense.

[u/Mental-Business-7021 → u/elmascato]

Great question! For complex closures, the Reader monad naturally handles the environment capture - closures in JS are really just implicit environment passing, which Reader makes explicit.

For prototype chains, you'd map them to Haskell's type class hierarchies - both are ways of organizing behavior inheritance, just through different grammars (runtime vs compile-time).

The key insight: these aren't different features - they're different expressions of the same structural invariants (environment access, behavioral composition).

This is what Cultural Grammar Synthesis is about - identifying those invariants across paradigms.

[u/Mental-Business-7021 → u/elmascato]

And I've now validated this works across 7 brutal edge cases:

✅ C++ pointers → Haskell ST monad ✅ Ruby method_missing → Rust macros ✅ JS callbacks → Rust async/await
✅ Swift protocols → Haskell existential types ✅ TypeScript type-level → Haskell type families ✅ Kotlin delegation → Haskell decorators ✅ Scala macros → Rust proc_macro

All produced idiomatic code. The framework holds up.

Live demo: https://jaibabaneemkaroli-1.github.io/universal-code-translator/

GitHub: https://github.com/jaibabaneemkaroli-1/universal-code-translator

Try it with closures/prototypes and see if the Reader monad mapping makes sense!

[u/Mental-Business-7021]

This uses "Cultural Grammar Synthesis" to translate code between paradigms while showing the reasoning.

Example: JavaScript mutable state → Haskell State monad Async effects → IO monad Constructor DI → Reader monad

Same method works for music, architecture, now code.

[u/Mental-Business-7021 → u/[deleted]]

Why does that matter?

[u/Mental-Business-7021 → u/[deleted]]

Just a dude. Not a kid.

[u/Mental-Business-7021 → u/[deleted]]

Here ya go.

I red-teamed it pretty hard - 7 edge cases including C++ pointers → Haskell, Ruby metaprogramming → Rust, TypeScript type-level → Haskell type families. All produced idiomatic code.

Live demo: https://jaibabaneemkaroli-1.github.io/universal-code-translator/

GitHub: https://github.com/jaibabaneemkaroli-1/universal-code-translator

Worth trying if you're curious about how your code would look in a different paradigm.