To clarify in Bobs remark : while you're still learning Haskell and the type system , things like lifted Num on functions can lead to some potentially confusing type errors.
That said, it's absolutely doable, and can be a very nice / powerful tool when used appropriately. On Sunday, September 1, 2013, Bob Ippolito wrote: > Yes, you can do that, but you probably shouldn't. > > See also: > http://www.haskell.org/haskellwiki/Num_instance_for_functions > http://hackage.haskell.org/package/applicative-numbers > > > > On Sat, Aug 31, 2013 at 10:01 PM, Christopher Howard < > christopher.how...@frigidcode.com <javascript:_e({}, 'cvml', > 'christopher.how...@frigidcode.com');>> wrote: > >> Hi. I was just curious about something. In one of my math textbooks I see >> expressions like this >> >> f + g >> >> or >> >> (f + g)(a) >> >> where f and g are functions. What is meant is >> >> f(a) + g(a) >> >> Is there a way in Haskell you can make use of syntax like that (i.e., >> expressions like f + g and f * g to create a new function), perhaps by >> loading a module or something? >> >> ______________________________**_________________ >> Haskell-Cafe mailing list >> Haskell-Cafe@haskell.org <javascript:_e({}, 'cvml', >> 'Haskell-Cafe@haskell.org');> >> http://www.haskell.org/**mailman/listinfo/haskell-cafe<http://www.haskell.org/mailman/listinfo/haskell-cafe> >> > >
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