as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
generate a correct program to calculate the sum of all elements of an array
user
def array_sum(arr):
    sum = 0
    for n in arr:
        sum += n
    return sum
assistant