[Haskell-cafe] Having trouble with zip12..

[Tony Morris]

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Michael Feathers wrote:
>
>
> I have some code that looks like this and I'm having trouble with
> it:
>
>
> zip12 ((tails . nub) flightPaths) wayPoints etopsPackets (hd
> geoCaches) groundSpeeds headings (map windShift headings)
> (regulations !! 2) (foldr (\|/) (tail pathDistances)) [ghy x | x <-
> [1..], full x] (nub . nub) arrivalSchedule

Hi Michael,
Sorry to distract from your issue, but I note that (nub . nub) can be
replaced with just 'nub' since the function nub is idempotent (f . f
== f).

<dibblego> @check \x -> (nub . nub) x == nub x -- is nub idempotent?
<lambdabot>  OK, passed 500 tests.

- --
Tony Morris
http://tmorris.net/

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