For some people this might read better also :
user=> (->> p (map :b) (reduce +))
9
2011/4/15 Andreas Kostler <andreas.koestler.le...@gmail.com>:
> Or: (reduce #(+ %1 (:b %2)) 0 p)
>
> :)
> On Apr 15, 10:51 am, Andreas Kostler <andreas.koest...@leica-
> geosystems.com> wrote:
>> (reduce + (map :b p))
>> Cheers
>> Andreas
>>
>> On 15 April 2011 10:43, Bhinderwala, Shoeb
>> <sabhinderw...@wellington.com>wrote:
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> > I am a beginner in Clojure.
>>
>> > I have a list of maps:
>>
>> > (def p '({:a 1 :b 2 :c 4}, {:a 2 :b 3 :c 5}, {:a 3 :b 4 :c 6}))
>>
>> > How do I add up all the :b values in the map? Result should be 9 (=2+3+4)
>>
>> > I know I should be using one of the higher level functions like apply,
>> > reduce and combine it with a custom filter function. But not sure how to
>> > write it.
>>
>> > *******-- Shoeb*
>>
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>> --
>> **********************************************************
>> Andreas Koestler, Software Engineer
>> Leica Geosystems Pty Ltd
>> 270 Gladstone Road, Dutton Park QLD 4102
>> Main: +61 7 3891 9772 Direct: +61 7 3117 8808
>> Fax: +61 7 3891 9336
>> Email: andreas.koest...@leica-geosystems.com
>>
>> ************www.leica-geosystems.com*************
>>
>> when it has to be right, Leica Geosystems
>>
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