Ah! fnil! That's just what I was wanting, and didn't even know it. Thanks!
I think I like this version best.
On Mon, Aug 19, 2013 at 2:44 AM, Philipp Meier <phme...@gmail.com> wrote:
>
> 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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