[Haskell-beginners] A first try

[David Place]

On Jun 27, 2011, at 1:45 PM, Yitzchak Gale wrote:

> David Place wrote:
>>>> Suppose the file is only partially demanded as in the case I quoted earlier.
>>>> 
>>>> print10 =
>>>>     do
>>>>       contents <- withFile "/usr/share/dict/words" ReadMode (\h -> hGetContents h)
>>>>       print $ take 10 contents
>>>> 
>>>> The file would never be closed.
> 
> I wrote:
>>> I tried it - it does close the file.
> 
>> II'm not sure what you mean.  Did you create a new version of withFile that behaves
>> as Heinrich suggested?  If so, please post its definition.
> 
> I just loaded Heinrich's withFile' in GHCi and ran it:
> 
> *WithFile> withFile' "/usr/share/dict/words" (print . take 10 . words)
> open
> ["A","A's","AOL","AOL's","Aachen","Aachen's","Aaliyah","Aaliyah's","Aaron","Aaron's"]
> close

Thanks.  I understand now.