[Haskell] the wonders of lazy IO
cgibbard at gmail.com
Tue Apr 19 01:19:52 EDT 2005
> Well, not quite. ($!) (like `seq`, out of which it's built) forces
> evaluation only to "weak head normal form": essentially enough to
> determine the top-level constructor. Here, for String, that means
> only the first character need be evaluated, which in practice means
> only the first bufferful of the file is read. You need to use ($!!)
> or something like it to force evaluation of the entire file contents.
> [See http://firstname.lastname@example.org/msg15819.html.]
Ah, good point, I missed that.
More information about the Haskell