> user=> (->> p (map :b) (reduce +))
Alternatively:
user> (def p '({:a 1 :b 2 :c 4}, {:a 2 :b 3 :c 5}, {:a 3 :b 4 :c 6}))
#'user/p
user> (:b (apply merge-with + p))
9
Depending on whether you'll want the other sums or not, this approach
might be appropriate.
U
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