On Thu, Jul 21, 2005 at 04:55:15PM +1000, Bernard Pope wrote:
> On Wed, 2005-07-20 at 17:06 +0100, Andy Gimblett wrote:
> > show (Prefix l p) = "(" ++ l ++ "->" ++ show p ++ ")"
> > show (External p q) = "(" ++ show p ++ " [] " ++ show q ++ ")"
> >
> > but to me the extensive use of ++ is not particularly readable.
>
> It is also inefficient because append has complexity proportional to the
> length of its left argument. That's why the Prelude defines:
>
> type ShowS = String -> String
>
> and functions like showsPrec, shows, showChar
It's not that bad in this case, because ++ is right-associative.
Best regards
Tomasz
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