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mwmitchell/gist:708130

Created November 20, 2010 20:33
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gistfile1.clj
(def r [{:id 1, :f "a"} {:id 1, :f "b"} {:id 2, :f "a"}])
; how to transform into:
[{:id 1 :f ["a" "b"]}, {:id 2 :f ["a"]}]
; reduce?
; note: the items inside of r will potential have lots of keys, but i only want to "collapse" the :f key into an array
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