Merge two array of objects with same keys, some object won't have the same value?

Question

I want to merge two arrays of objects. The keys are the same but the values might not always be the same.

Any solution is appreciated preferably in javascript, but

Answer 1

Here's a Python solution. This modifies g, which you may or may not want.

c_by_id = {d['id']: d for d in c}
for item in g:
    item.update(c_by_id.get(item['id']), {})