On Wed, Sep 8, 2010 at 8:06 PM, Tim Perry
The original is in what is called "point free" form. Values are called "points" so you have left out the value making the function "point free". I think this is one of the most annoying "features" of Haskell because you can't glance at a function and know how many parameters it takes unless you also know how many parameters each of the functions it uses need. But that aside, it is very common. Real World Haskell covers it in Chapter 5. http://book.realworldhaskell.org/read/writing-a-library-working-with-json-da...
Given that the notion of argument number isn't quite right in Haskell and that you should put a type signature on all exported functions which provides more exact information on the function behaviour anyway... I would say that point-free is worth it for the clarity it affords to the accustomed Haskeller (all but the most twisted functions written in point-free style will only take "one" argument anyway). -- Jedaï