BTW, since we are takling a bout Haskell, an interesting thing I noticed about it is that precisely I don`t need to memorize the whole standard library. Whenever I have a though like "man, I whished that there was a function that gor me a Bar from this list of Foos" I can just pass the "[Foo] -> Bar" type to Hoogle[1] and it will magically find the name of all the functions in the standard libraries that have compatible or similar type signatures.

[1] http://www.haskell.org/hoogle/