It doesn't have to be a finite grid. Here is another comonadic implementation of Life with an infinite board: https://github.com/BartoszMilewski/GameOfLife/blo

It doesn't have to be a finite grid. Here is another comonadic implementation of Life with an infinite board: https://github.com/BartoszMilewski/GameOfLife/blob/master/Life.hs https://github.com/BartoszMilewski/GameOfLife/blob/master/Li... Either version would definitely take me more than five minutes to write, but then again it would take me more than five minutes to write the APL version too. For someone like Penner or Milewski the comonadic Haskell versions might be achievable in the five minute ballpark.