I would write like this
(defn sum-by-type [coll]
(->> coll
(map (fn [ {v "Value" t "Type" } ] {t (read-string v) }))
(apply (partial merge-with +))))
If the map is keyword int map, it will be simpler than above
(defn sum-by-type [coll]
(->> coll
(map (fn [ {v :value t :type } ] {t v}))
(apply (partial merge-with +))))
Jestan.
On Oct 14, 10:25 pm, der <derealme.derea...@gmail.com> wrote:
> Hi,
>
> I'm a Clojure newbie trying to the following simple task:
>
> Given a list of maps of the followign format: ({"Type" "A", "Value"
> "5"} {"Type" "B", "Value" "4"} {"Type" "A", "Value" "7.2"} {"Type"
> "A", "Value" "25.4"} {"Type" "B", "Value" "2.982"})
>
> I want to compute a list of maps such that each type appears once in
> the list and the value of the type is the sum of the values, so that
> in the example it would be:
>
> ({"Type", "A", "Value", "37.6"} {"Type", "B", "Value", "6.982"})
>
> Any ideas?
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