@Bert first& second are exactly what I was looking for. Thanks. @Thomas: I'm not sure what you mean by fmap What I wanted is to do this:
let f = map $ first (*2) f [(1,1),(2,2),(3,3),(4,4)] [(2,1),(4,2),(6,3),(8,4)]
On Fri, Mar 9, 2012 at 9:23 PM, Thomas Davie
first ofc also being known as fmap.
Bob
if (*ra4 != 0xffc78948) { return false; }
On 9 Mar 2012, at 19:09, Brent Yorgey wrote:
On Fri, Mar 09, 2012 at 09:07:24PM +0200, Ovidiu Deac wrote:
Does anybody know if there are any functions like these in the Haskell
libray?
updateSnd f (x,y) -> (x, f y)
updateFst f (x,y) -> (f x, y)
Yes: 'first' and 'second' from Control.Arrow.
-Brent
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