Re: [Haskell-cafe] I just don't get it (data structures and OO)

Phlex writes:

The thing is, now that i have my planet p... i want to change it's age ... and get back the new state of the universe...

It is true, there is often a significant amount of "boilerplate" code needed to wrap a simple planet-change nested deep within a universe structure. There has been lots of research into easing the pain of creating this outer traversal code - search for "Scrap your boilerplate", "compos", "Play", "generic traversal" (in conjunction with "Haskell"). Regards, Malcolm