Is this the snake monad? :-) Stuart
> One way to approach this without mutation is as follows: > > Decide on a data representation that represents the entire state of > the game world at a given instant. > > Write a function which can draw this state. > Write a function which takes the state and player keypresses as input, > and returns a new updated state. > Write a function which takes the state and returns the new state just > from time elapsing. > > Note that none of the above functions mutate anything. It's all about > returning fresh states, which fits well with Clojure's standard > handling of data structures. > > Then write a loop that consumes an initial state, and creates a game > experience by repeatedly applying the above functions. No globals or > refs are required, just keep passing the new states back into the loop > for further processing. > > This is an outline of the strategy employed by the "world" teachpack > that accompanies the "How to Design Programs" curriculum that uses PLT > Scheme. Students routinely develop the snake program as a homework > assignment, using this approach. > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
