Difference between revisions of "Num instance for functions"
Jump to navigation
Jump to search
.
(merely a copy of my mail to Haskell-Cafe) |
(more Humor than Proposal) |
||
Line 25: | Line 25: | ||
+ | [[Category:Humor]] |
||
[[Category:Proposals]] |
[[Category:Proposals]] |
Revision as of 13:08, 17 April 2007
Some people have argued, that Num
instances of (->)
would be nice in order
to add functions nicely, say for
f, g :: Num a => b -> a
you would define
(f+g) x = f x + g x
With an according definition of fromInteger
fromInteger = const
numeric literals would also denote constant functions. This allows
f+2 == \x -> f x + 2
Even nicer, the mathematically established notation of omitting the multiplication dot
2(x+y) :: Integer
will now be parsed by a Haskell compiler to the most obvious meaning
2 :: Integer
! :-)