On Thu, Jun 16, 2011 at 5:38 PM, Johan Tibell <[email protected]>wrote:
> On Thu, Jun 16, 2011 at 3:01 PM, Dmitri O.Kondratiev <[email protected]> > 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 > > I don't think implementing this function in the library would add much > as it cannot be implemented more efficiently with access to the > internal representation than it can using the public API. Just write > > transMap = M.fromList . map swap . M.toList > > and stick it in some utility file. > > Johan > Yes, this is a good one. Thanks!
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