zipmap could also potentially use transients (which would be a nice
addition).
keys/vals are also lazy, so I would be surprised if there was any
performance
difference with walking the seq "twice".
Thanks,
Ambrose
On Sun, Feb 2, 2014 at 11:35 AM, Justin Smith <noisesm...@gmail.com> wrote:
> Realistically, how many situations are there where running keys and vals
> independently is preferable to running seq once and using the two element
> vectors that returns?
>
> Usually this way one can avoid walking the whole thing twice.
>
> (into {} (map (fn [[k v]] [k (inc v)]) {:a 0 :b 1})) is representative of
> the idiom I usually use. As a bonus, into uses transients, which can create
> the resulting structure in fewer cycles / less time.
>
>
> On Saturday, February 1, 2014 10:00:33 AM UTC-8, Sam Ritchie wrote:
>
>> Looks like Rich just chimed in with:
>>
>> "keys order == vals order == seq order "
>>
>> Matching Socks
>> January 31, 2014 7:31 PM
>> Actually, http://dev.clojure.org/jira/browse/CLJ-1302 "keys and vals
>> consistency not mentioned in docstring" was declined, with the comment "The
>> absence of this property in the docs is correct. You should not rely on
>> this."
>>
>>
>>
>> On Wednesday, August 11, 2010 6:03:39 PM UTC-4, Chouser wrote:
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