Yeah, fmap is perfect and definitely the most elegant for the specific
problem described by the OP. I had never heard of that one.
On Tue, Feb 22, 2011 at 6:56 PM, Benny Tsai <benny.t...@gmail.com> wrote:
> There is fmap from clojure.contrib.generic.functor, which expects a
> function of arity 1, for just the value:
>
> (use 'clojure.contrib.generic.functor)
> (require '[clojure.string :as str])
>
> (def my-map {:first "john" :last "smith" :age 25})
>
> (defn my-fn [value]
> (if (string? value)
> (str/upper-case value)
> value))
>
> user=> (fmap my-fn my-map)
> {:first "JOHN", :last "SMITH", :age 25}
>
> On Feb 22, 4:23 pm, rob levy <r.p.l...@gmail.com> wrote:
> > The usual intuitive options for this are reduce, zipmap, or into. You
> can
> > also write a lazily recursive solution. I wonder why there's no function
> in
> > core that lazily re-constructs the map with the results of the function?
> It
> > seems to have been discussed on the list at least once or twice. It
> seems
> > like there would have to be two versions of it, one expecting a function
> > with an arity of one (for just the value) and another expecting an arity
> of
> > two (key and value).
> >
> >
> >
> >
> >
> >
> >
> > On Mon, Feb 21, 2011 at 10:08 PM, yair <yair....@gmail.com> wrote:
> > > I'm hoping this is a dumb question and I've missed something obvious.
> > > I have a map with various key-value pairs and I want to transform some
> > > of the values, e.g.
> >
> > > (def mymap {:first "john" :last "smith" :age 25}) and say I want to
> > > change the strings to be upper case.
> > > Right now all I can think of doing is using reduce and passing in an
> > > empty map and the re-associating each key with the (possibly)
> > > transformed value. Is there something like the map function that
> > > takes two parameters, one a function that receives a pair and returns
> > > a new pair, and the other a map, and returns a map that's
> > > reconstituted from those pairs?
> >
> > > Thanks
> >
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