Should Haskell also provide unrestricted side effects, setjmp/
longjmp, missile launching functions, etc? After all, people who
don't want to use them can just avoid them. :)
On Nov 15, 2006, at 05:07 , Neil Mitchell wrote:
Hi
Yes, these techniques are fairly well known now, and hopefully
some of
the more experienced Haskellers are using them (I certainly use the
non-empty list tricks). Any anyone with more than 6 months Haskell
knows
to avoid fromJust.
I'm not, I use fromJust all the time. Ditto for head, init,
maximum, foldr1...
One solution would be to deprecate fromJust (we recently decided
not to
add fromLeft/Right for the same reasons). Having a compiler
warning is a
good way to encourage good behaviour :)
We didn't decide not to add fromLeft/fromRight, Russell decided to
defer it to a later patch. I am still very interested in them being
put in!
There seem to be two sides forming to this issue - use partial
functions or don't. I don't see why we should restrict the functions
available to the partial people, when the unpartial people can choose
not to use them.
Thanks
Neil
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