[Haskell-cafe] Data.Map: Values to keys and keys to values

[Daniel Peebles]

Why not make it unlossy and have:

trans :: (Ord k, Ord a) => Map k a -> Map a (Set k)



On Thu, Jun 16, 2011 at 9:10 AM, Johan Tibell <johan.tibell at gmail.com>wrote:

> On Thu, Jun 16, 2011 at 3:01 PM, Dmitri O.Kondratiev <dokondr at gmail.com>
> wrote:
> > Hi,
> > Data.Map has many great functions, yet I could not find the one that
> allows
> > from one map create another map where keys are values and values are keys
> of
> > the first one.
> > Something like:
> > transMap:: (Ord k, Ord a) => Map k a -> Map a k
> >
> > Does such function exist?
>
> Note that such a function would be lossy as there might be duplicate
> values in the map.
>
> Cheers,
> Johan
>
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