walk is good but it's not lazy. If you want to preserve laziness you can do:
(defn map-vals
"transform a map by mapping it's keys to different values."
[f m]
(into {} (map (fn [[key val]] [key (f val)]) m)))
This is also nice because you can then write functions whose arguments
are [val] instead of [key val] and ignoring the key.
--Robert McIntyre
On Mon, Sep 6, 2010 at 12:06 PM, Sunil S Nandihalli
<[email protected]> wrote:
> (clojure.walk/walk (fn [[key val]] [key (* 2 val)]) identity {:a 1 :b 2})
>
> On Mon, Sep 6, 2010 at 9:26 PM, Sunil S Nandihalli
> <[email protected]> wrote:
>>
>> Nicolas
>> I am not sure of the performance characteristics.. but you may want to
>> look at
>> (clojure.walk/walk #(do (println "inner : " %) %) #(do (println "outer : "
>> %) %) {:a 1 :b 2})
>>
>> Best regards,
>> Sunil.
>> On Mon, Sep 6, 2010 at 9:10 PM, Nicolas Oury <[email protected]>
>> wrote:
>>>
>>> Dear all,
>>>
>>> is there a function to map a function to all values in a map, keeping
>>> the same keys?
>>> Reducing from the seqed map seems a bit slower that what could be done
>>> directly...
>>>
>>> Best,
>>>
>>> Nicolas.
>>>
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