When Your 'Language' of Choice is a Cellular Automaton
Description
This image is a screenshot of a tweet from user A.J. (@aj_dev_smith), following the 'bizarre coding interview' meme format. The tweet text reads: 'The most bizarre coding interview I've ever done was at Facebook when as usual I asked a candidate to write in any language of their choice.. And they nonchalantly said "I'll write it in Conway's Game of Life", to which I almost let loose a chuckle until...'. The image below is a screen capture of a complex simulation within Conway's Game of Life, set against a black background. It displays an intricate pattern of white pixels forming logical structures and pathways. A section of the simulation is annotated with red text that says 'Drawing a square in a circle', indicating a complex computational task being performed. This meme's humor is aimed at a deeply technical audience. Conway's Game of Life is a famous cellular automaton that is Turing-complete, meaning it can compute anything a universal Turing machine can. Choosing it as a 'language' is an extreme intellectual flex, demonstrating a mastery of theoretical computer science and computability theory far beyond what's expected in a standard coding interview
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The candidate passed the interview, but the solution is still compiling. They estimate the final output will be ready by generation 4,128,372, assuming no unexpected glider collisions
By generation 42 the candidate had a lock-free queue running on gliders - at which point I realized the real undecidable problem was our onboarding docs
When your code review takes 10,000 generations to complete but at least it's deterministic and has zero dependencies
When the interviewer said 'any language,' they were probably thinking Python or Java, not a Turing-complete zero-player game from 1970. This candidate essentially said 'I'll implement your algorithm by carefully arranging initial conditions in a cellular automaton and letting emergent behavior do the computation' - which is simultaneously the most over-engineered and most theoretically elegant solution possible. It's the technical interview equivalent of being asked to get to the office and showing up via trebuchet: technically valid, impressively creative, and raising serious questions about production readiness
Never say “any language” in an interview - someone will prove Turing-completeness with glider guns and suddenly your rubric includes emergent behavior and lattice geometry
Interviewer: 'Any language.' Candidate: 'Hold my glider - this square's about to emerge from the void.' Pure Turing-complete flex
We said “any language”; they shipped a solution whose compiler was a Gosper glider gun and whose runtime was B3/S23 - try nitpicking test coverage when the tests are oscillators