intersection between two arrays of objects

I have two arrays of objects:
user and usersActive
I want to find the intersection between these to arrays based on a property (the id) of the objects in these arrays
Example:
user = [ user(1) user(2) ... user(n)]
usersActive = [user(1) user(2) ... user(p)]
(p<n)
user(j).id in user is equal to user(k).id in usersActive, so on and so forth.
after that, I want to change the user(j).id in user by user(k).id usersActive

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