[Haskell-cafe] Re: Functional version of this OO snippet

[Thomas Davie]

On 5 Dec 2008, at 17:00, Duncan Coutts wrote:

> On Fri, 2008-12-05 at 16:50 +0100, Thomas Davie wrote:
>
>> Sure, and he could then use a fold instead of a map.  Reading files  
>> is
>> problematic, but as long as you're only doing it once (the most  
>> common
>> situation) is entirely fine wrapped up in an unsafePerformIO.
>
> Nooooo!
>
> Please don't go telling people it's entirely fine to use  
> unsafePerformIO
> like that (or at all really).

Exactly what isn't fine about it?

Bob