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ajsharp/gist:1384628

Created November 22, 2011 01:37
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gistfile1.clj
(defn count-reduce
[memo obj]
(let [key (str (year obj) "/" (month obj))]
(if (get memo key)
(merge memo {key (inc (get memo key))})
(merge memo {key 1}))))
(str
(reduce count-reduce {}
(map coerce-date
(map :created_at coll))))
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ajsharp commented Nov 22, 2011

19:41 (ajsharp) amalloy: looks like merge-with actually merges the values in the two maps, no?
19:41 ambrosebs has left IRC (Remote host closed the connection)
19:42 (TimMc) brehaut: fnil!
19:42 (amalloy) (apply merge-with + (for [obj coll] {(str (year obj) "/" (month obj)) 1}))

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