Am Samstag, 17. August 2013 11:19:23 UTC+2 schrieb David Chelimsky:
>
> Hey Steven, here's a variation of my first example that, I think, gets
> closer to what you're proposing (with maybe-add handled in-line):
>
> (defn to-consolidated-map [parts]
> (reduce (fn [h [k v]]
> (assoc h k (+ (get h k 0) v)))
> {}
> parts))
>
An expression of the form (assoc m k (fn (get m k a) v))) can replaced with
update-in. If you need a default value, then add fnil to the party:
(defn to-consolidated-map [parts]
(reduce (fn [h [k v]]
(update-in h [k] (fnil + 0) v))
{}
parts))
-billy,
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