[Haskell-beginners] \x -> x < 0.5 && x > -0.5
darrinth at gmail.com
Fri Oct 23 11:25:57 EDT 2009
On Fri, Oct 23, 2009 at 10:25 AM, pl <pl.listas at gmail.com> wrote:
> filter ((<=0.5) . abs) xs
pure (&&) <*> (< 0.5) <*> (> -0.5)
liftM2 (&&) (< 0.5) (> -0.5)
Someone suggested that this was an example of the reader monad but I
don't get that.
> :i (->)
data (->) a b -- Defined in GHC.Prim
instance Monad ((->) r) -- Defined in Control.Monad.Instances
instance Functor ((->) r) -- Defined in Control.Monad.Instances
instance Applicative ((->) a) -- Defined in Control.Applicative
That's what I see working here.
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