augustss (guest) 15 Feb 2009 18:01
Im my opinion the belief that you can get a good understanding of Haskell without writing Haskell programs is utter nonsense.
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augustss (guest) 15 Feb 2009 18:01
Gee, I hope that attitude doesn't prevent you from studying languages you don't program in. You should try it some time - I know lots of things about lots of languages I've never programmed in.
I know lots of things about lots of languages I have not programmed in. But to claim good understanding of a language I want years of experience writing actual code. Either I'm a slow learner or we have a different opinion on what a good understanding is.
So what is the best introduction out there now (in a book or online) for someone who knows a bit of category theory, is comfortable with imperative programming, and wants to learn haskell? I've been reading Real World Haskell but it annoys me because it doesn't explain things properly ("Just do this for now, maybe we'll tell you how it really works later").
Gosh, that's a good question. There is no one best resource that I've found. I'll put together a list this week; in the meantime, Goldblatt is an excellent writer who tells you why stuff is significant: Topoi: the Categorial Analysis of Logic (also available on paper). Klinger's The Haskell Programmer's Guide to the IO Monad - Don't Panic is pretty good too, but you have to stare at it for a while. Pierce's Basic Category Theory for Computer Scientists is very useful, but also very concise; 80 pages, and he doesn't cover monads. But he has some very useful examples; I found I kept going back to Pierce as I worked through other texts.
Thanks! I'll look at those and I look forward to reading your list.
If one understands catamorphisms/paramorphisms/anamorphisms then the Charity language is also a nice toy to play with.
On thing that especially surprised me, when experimenting with Charity, is how little composition rather than application actually impacts your coding style. Basically you use an uncurried style and that is all, you have learned how to cope with juxtaposition as composition. The fold as the only recursion primitive however has far reaching consequences, meaning that some otherwise simple functions are coded less than intuitively.
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