[Haskell-beginners] Re: Iterating through a list of char...

[Daniel Fischer]

Am Donnerstag 29 April 2010 22:39:05 schrieb Jean-Nicolas Jolivet:
> Every solution I found was iterating to a list of character one
> character at a time, and outputting a character as a result (whether it
> is by recursion, mapping, etc..),

Well, that's necessary for what you want to do, isn't it?

> however, what I was trying to explain
> in my previous post was that; when I am processing the escape character,
> this character should not be added to the resulting string... This is
> where I decided to use the Maybe monad..I'm just wondering if there is a
> better way...!

Depends on your criteria.
For raw performance, I think the directly coded recursion is a bit better

(btw,

fooGen e esc norm = go False
    where
        go b (x:xs)
          | x == e    = go True xs
          | b         = esc x : go False xs
          | otherwise = norm x : go False xs
        go _ [] = []
).

For code cleanliness, catMaybes&zipWith and a good directly coded recursion 
are about equal.

For leetness, the foldr is beats them, but surely one could do much 
'better'.