[Haskell-beginners] fmap fmap
fbrubacher at gmail.com
Sun Aug 9 12:39:08 EDT 2009
fmap . fmap is close to applicative ?
is it possible to do applicative instead of combining 2 fmaps ?
On Wed, Aug 5, 2009 at 12:29 AM, Tony Morris <tonymorris at gmail.com> wrote:
> Michael P Mossey wrote:
> > How does one write
> > fmap (fmap (*2)) xs
> > without parenthesis? (Using . and $ instead.)
> > I don't really understand . and $ well enough I guess. I tried a bunch
> > of stuff but nothing worked.
> > -Mike
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> > Beginners at haskell.org
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> fmap . fmap $ (*2)
> or perhaps:
> (fmap . fmap) (*2)
> Tony Morris
> Beginners mailing list
> Beginners at haskell.org
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