[Haskell-cafe] Monadic vs "pure" style (was: pros and cons of sta tic typing and side effects)

[Philippa Cowderoy]

On Wed, 31 Aug 2005, Philippa Cowderoy wrote:

> On Wed, 31 Aug 2005, Ben Lippmeier wrote:
>
>> I imagine this would be an absolute pain for library writers. Notice that 
>> we get Data.Map.map but no Data.Map.mapM - or perhaps there's some magical 
>> lifting combinator that I am not aware of?
>> 
>
> sequence (Data.Map.map (\x -> someAction x) someMap)
>

Or not - I really should've at least typechecked that before sending. 
Wonder how fast toList and fromList are?

-- 
flippa at flippac.org

There is no magic bullet. There are, however, plenty of bullets that 
magically home in on feet when not used in exactly the right circumstances.