On 2009-10-21 18:27 -0700 (Wed), michael rice wrote: > Those nested IF/THEN/ELSEs are real killers. I kind of use them to > sort out my thoughts, then end up with a nested mess. The restructuring > to WHENs went smoothly and looks a lot cleaner besides.
Indeed. Monadic control flow is one of the basic keys to being able to write nice code in Haskell; it's the moral equivalant of using polymorphism rather than than "case" or "switch" in OO languages. (Well, some would disagree, but that gets into the whole OO vs. functional debate.) You'll probably want to spend some time with one of the zillion monad tutorials at some point (I like "All About Monads") to learn more about these things. BTW, look up the source code for "when". :-) http://haskell.org/ghc/docs/latest/html/libraries/base/src/Control-Monad.html#when cjs -- Curt Sampson <[email protected]> +81 90 7737 2974 Functional programming in all senses of the word: http://www.starling-software.com _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
