Sum of Even Numbers

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In this problem, you will learn how to iterate through a list of numbers and apply a condition to filter out specific elements before performing an aggregation. This is a fundamental concept in programming, often used in data processing and analysis.

Your task is to write a function that takes a list of integers as input. The function should iterate over each number in the list, determine whether it is an even number, and if so, add it to a running total. Finally, the function should return the total sum of all the even numbers it encountered.

You can approach this problem in a few ways. You might use a simple for loop with an if statement, or you might employ more advanced Python features like list comprehensions combined with the built-in sum() function for a more concise and idiomatic solution.

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python - Approach 1

def sum_even_numbers(numbers):
    # Approach 1: Generator expression within continuous sum
    return sum(n for n in numbers if n % 2 == 0)

python - Approach 2

def sum_even_numbers(numbers):
    # Approach 2: Standard loop with conditional
    total = 0
    for n in numbers:
        if n % 2 == 0:
            total += n
    return total

python - Approach 3

def sum_even_numbers(numbers):
    # Approach 3: Using filter() and lambda
    return sum(filter(lambda x: x % 2 == 0, numbers))

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Sum of Even Numbers

Algorithm Flow

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