I use update-vals from https://github.com/jaycfields/jry fairly often. As
long as you don't mind doing the pred check in the fn you pass to
update-vals, it should do the trick.

Cheers, Jay


On Fri, Jul 5, 2013 at 5:14 PM, Jim - FooBar(); <jimpil1...@gmail.com>wrote:

> You'll never really 'replace' any values so why not reduce/reduce-kv ?
> Just build a new map out of the old one...
>
> Jim
>
>
> On 05/07/13 21:59, Colin Yates wrote:
>
>> Hi all,
>>
>> I think this is one of those questions which has quite a few answers, but
>> given a map, how do I replace the values by applying a function to those
>> values, but only if they meet a condition?
>>
>> I understand the building blocks of (map..), (filter..), (assoc-in..) and
>> (filter..) and I can see how something could work using those pieces but is
>> would be pretty verbose.  I am sure there is probably a much more simple
>> way using a more abstract function.
>>
>> The actual use case is I have a list of maps as returned from the
>> clojure.java.jdbc framework and they contain timestamps.  I want to replace
>> all the timestamps with (for example) to a Joda LocalDate using the
>> excellent clj-time library.
>>
>> Any pointers?
>>
>> Thanks!
>>
>> Col
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