Functional

functional_example.py

def sum_squared_array(a):
  for index in range(len(a)):
      a[index] = a[index] * a[index]
      
  for index in range(len(a)):
       total_not_functional += a[index]
      
total_not_functional = 0      
sum_squared_array([1, 2, 3, 4])

total_function = reduce(lambda element, collector: collector + element,
                        map(lambda x: x ** 2, [1, 2, 3, 4]), 0)
                        
total_function_simple = sum(map(lambda x: x ** 2, [1, 2, 3, 4]))