Thanks BG and all other responses for your help.
I have a followup question, could the same approach be extended if I
wanted to group-by multiple entries in the map? e.g. assuming the map
now had Type and Subtype and I wanted to "group-by" the pair Type and
Subtype, would the same approach work?
On Oct 14, 9:45 pm, Baishampayan Ghose <b.gh...@gmail.com> wrote:
> > I'm a Clojure newbie trying to the following simple task:
>
> >Givenalistofmapsof 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 alistofmapssuch that each type appears once in
> > thelistand 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?
>
> I might write it like this -
>
> (defn sum-by-type [coll]
> (for [[k v] (group-by #(% "Type") coll)]
> {"Type" k "Value" (apply + (map (comp #(Float/parseFloat %)
> #(% "Value")) v))}))
>
> Regards,
> BG
>
> --
> Baishampayan Ghose
> b.ghose at gmail.com
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