<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Debug the following code and update the list "result" accordingly.
def foo(nums):
    result = []
    for val in nums:
        val += 2
        result.append(val)
        return result

nums = [1, 2, 3, 4]<|im_end|>
<|im_start|>assistant
def foo(nums):
    result = []
    for val in nums:
        val += 2
        result.append(val)
    return result

nums = [1, 2, 3, 4]

result = foo(nums)<|im_end|>
