Cosine in the BEST LANGUAGE EVER

Anthony Wang — Fri, 09 May 2025 00:08:43 -0400

Yeah yeah I know the title is definitely clickbait, but Lean is basically the Ali’s of programming languages. The moment I stepped foot inside Ali’s, I knew this was the perfect restaurant for me that I needed all my life. Same for Lean. IT’S SO LIFE-CHANGING TRUST ME YOU HAVE TO TRY IT.

Kublai: Lean? Isn’t that a proof assistant?

That’s right, Lean is primarily used as a proof assistant, especially for formal math. But it’s also an amazing, highly extensible functional programming language for automating proofs, and even for general-purpose programming! Think of it as the best parts of Haskell and Dafny and Rust combined together, plus lots more fun stuff like dependent types and a giant math library and massive Unicode abuse. Lean even runs on my phone! Honestly I don’t think I can go back to coding in other languages after trying Lean, other than Python for short scripts and Rust for performance-important stuff.

Haskelling My Python

Anthony Wang — Sat, 05 Apr 2025 13:08:44 -0400

A few years ago, Pleng showed me a really cool trick you can do with lazy infinite lists in Haskell.

Kublai: Oh no, not Haskell! 😱

Don’t worry. There will be no mandatory Haskell in this post (although it is a really nice language which you should check out!). Instead, today Erik asked me if that trick also works using infinite Python generators, and turns out it does!

Haskell on Unnamed Website

Cosine in the BEST LANGUAGE EVER

Haskelling My Python