Your version is already succinct, is there something you particularly
don't like about it?
I would probabbly write it like this:
(defn inc-values-in-map
[map keys]
(reduce #(assoc %1 %2 (inc (%1 %2 0))) map keys))
Because it caters better with (inc-values-in-map m
[:one :three :one :four])
Or more readably:
(defn assoc-fn
[f default]
(fn [m k]
(assoc m k (f (m k default))))
(defn inc-values-in-map
[map keys]
(reduce (assoc-fn inc 0) map keys))
But its longer than yours :)
On Jun 18, 3:21 pm, Rowdy Rednose <rowdy.redn...@gmx.net> wrote:
> Say I've got this map of keys to integer values:
>
> (def m {:one 0 :two 0 :three 0})
>
> I want to write a function "inc-values-in-map" that takes such a map,
> a collection of keys and will increment those keys' values in the map.
>
> In other words, calling
>
> (inc-values-in-map m [:one :three])
>
> should return
>
> {:one 1, :two 0, :three 1}
>
> I've come up with this:
>
> (defn inc-values-in-map
> [map keys]
> (merge-with + map (zipmap keys (repeat 1))))
>
> Aren't there more elegant ways to implement this function?
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