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Life & fun · June 5, 2025

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Lambduck, a Functional Programming Brainfuck

What if Brainfuck was less like C and more like Scheme? The interpreter implemetation is pretty bad. It's not very fast, it's not very good, and it's probably not very correct. But maybe there's some vaguely interesting programs you could write with it! For example, the Y combinator: λf. (λx. f (x x)) (λx. f (x x)) is written as: \` \`1 `0 0 \`1 `0 0

Lambduck, a Functional Programming Brainfuck launched on June 5, 2025 with 70 votes, #506 of 7,999 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.

Visit imjakingit.github.io ↗Alternativestop 6% of June 2025

In plain words

Lambduck is an esoteric programming language that combines Brainfuck's minimalist design with functional programming concepts inspired by Scheme. It allows users to write programs using lambda calculus notation, such as the Y combinator, in a compact syntax. The interpreter is intentionally basic and slow, but enables writing unconventional functional programs for those interested in experimental language design.

written from the facts on this page · September 2026

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