Can someone help me write the following function:
I have two lists of maps as inputs:
(def xs [{:id 1 :val 10}
{:id 2 :val 20}
{:id 3 :val 30}
{:id 4 :val 40}])
(def ys [{:id 2 :val 20}
{:id 3 :val 30}
{:id 5 :val 50}
{:id 6 :val 60}])
I want to create a result zs which is the union of xs and ys, except that
if the :id occurs in BOTH then I want to multiply the corresponding :val.
The result zs should be:
[{:id 1 :val 10}
{:id 2 :val 400} <-- :id 2 occurs in both collections, so multiply the
:val fields
{:id 3 :val 900} <-- :id 3 occurs in both collections, so multiply the
:val fields
{:id 4 :val 40}
{:id 5 :val 50}
{:id 6 :val 60}]
Thanks in advance,
Shoeb
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