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2010-07-14T15:35:08.577
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You know all you need to go forth and write code. But if you're looking for more Haskell-y things to learn about, may I suggest: <ul> <li>Type families. Very handy feature. It basically gives you a way to write functions on the level of types, which is handy when you're trying to write a function whose parameters are polymorphic in a very precise way. One such example:</li> </ul> <code><pre> data TTrue = TTrue data FFalse = FFalse class TypeLevelIf tf a b where type If tf a b weirdIfStatement :: tf -> a -> b -> tf a b instance TypeLevelIf TTrue a b where type If TTrue a b = a weirdIfStatement TTrue a b = a instance TypeLevelIf FFalse a b where type If FFalse a b = b weirdIfStatement FFalse a b = a </pre></code> This gives you a function that behaves like an <code>if</code> statement, but is able to return different types based on the truth value it is given. If you're curious about type-level programming, type families provide one avenue into this topic. <ul> <li>Template Haskell. This is a huge subject. It gives you a power similar to macros in C, but with much more type safety.</li> <li>Learn about some of the leading Haskell libraries. I can't count how many times parsec has enabled me to write an insanely useful utility quickly. dons periodically publishes a list of popular libraries on hackage; <a href="http://donsbot.wordpress.com/2010/06/30/popular-haskell-packages-q2-2010-report/" rel="nofollow noreferrer">check it out</a>.</li> </ul>
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1. POWhat's the next step to learning Haskell after monads?
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1. USintoverflow
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