[Haskell] [Haskell - I/O] Problem with 'readFile'
rjmh at cs.chalmers.se
Sun Aug 27 09:45:21 EDT 2006
> Hello L.,
> Sunday, August 27, 2006, 12:43:24 PM, you wrote:
>>> > length s `seq` writeFile f ("hello"++s)
>> length mates_str `seq` return ()
> it's the same. i recommend you to use:
> return $! tail mates_str
> $! defined as
> f$!x = x `seq` f x
> 'tail' should be slightly faster than 'len'
> Best regards,
> Bulat mailto:Bulat.Ziganshin at gmail.com
But you need to evaluate the result of readFile all the way to the end--you
need to use a function that traverses the entire file contents. Otherwise
the file will be left open to read the bit you haven't traversed. Hence
length rather than tail.
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