Good to know, thank you !
2009/12/17 Christophe Grand <[email protected]>
> Hi Laurent,
>
> If you want to use transients, since the keyset is unchanged, it
> should perform slightly better when using (transient m) instead of
> (transient {}) as the seed to reduce.
>
> Christophe
>
> On Dec 17, 3:46 pm, Laurent PETIT <[email protected]> wrote:
> > AFAIK, such a function is still not in clojure core because it's not
> clear
> > to Rich whether f should have one argument (the value), or 2 arguments
> (key
> > + value).
> >
> > Your version seems good, you can maybe improve it a little bit by using
> > transients (not tested):
> >
> > (persistent!
> > (reduce (fn [m [k v]]
> > (assoc! m k (f v))) (transient {}) m))
> >
> > HTH,
> >
> > --
> > Laurent
> >
> > 2009/12/17 C. Florian Ebeling <[email protected]>
> >
> > > I was just wondering how a #'map for maps could be done most
> > > succinctly. Came up with this:
> >
> > > (defn mapmap
> > > "Map values of map m using function f."
> > > [f m]
> > > (reduce (fn [m [k v]]
> > > (assoc m k (f v))) {} m))
> >
> > > But there is probably a more straightforward way. What do you use?
> >
> > > Florian
> >
> > > --
> > > Florian Ebeling
> > > [email protected]
> >
> > > --
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