Funny, I was thinking this morning about using something like this to convert to/from Church numerals:
church n = foldl (.) id . replicate n unchurch f = f succ 0 I think it's a nice pattern. Nick On Friday, October 26, 2012 11:41:18 AM Greg Fitzgerald wrote: > Hi Haskellers, > > I've recently found myself using the expression: "foldr (.) id" to compose > a list (or Foldable) of functions. It's especially useful when I need to > map a function over the list before composing. Does this function, or the > more general "foldr fmap id", defined in a library anywhere? I googled and > hoogled, but no luck so far. > > Thanks, > Greg _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
