combine_objects.md

Combine objects

• Your task is to write a function that takes two or more objects and returns a new object which combines all the input objects.

• All input object properties will have only numeric values. Objects are combined together so that the values of matching keys are added together.

Samples:

objA = { 'a': 10, 'b': 20, 'c': 30 }
objB = { 'a': 3, 'c': 6, 'd': 3 }
combine(objA, objB) # Returns { a: 13, b: 20, c: 36, d: 3 }

The combine function should be a good citizen, so should not mutate the input objects.

Solution:

def combine(*args):
    combined= {}
    for i in args:
        for j,k in i.items():
            if j in combined:
                combined[j] += k
            else:
                combined[j] = k
    return combined

objA = { 'a': 10, 'b': 20, 'c': 30 }
objB = { 'a': 3, 'c': 6, 'd': 3 }
print(combine(objA, objB)) # Returns { a: 13, b: 20, c: 36, d: 3 }