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Control Flow · interview question

What is the healthiest performance judgment around guard clauses?

Multiple choiceMediumchapter-2-curatedpremiumcontrol-flowguard-clauses
python
def validate_line(sku: str, quantity: int) -> None:
    if not sku:
        raise ValueError("sku is required")
    if quantity <= 0:
        raise ValueError("quantity must be positive")
Choose one answer
Answer and explanation

Correct answer

C. Measure before optimizing, then change the part that actually dominates cost instead of guessing from style alone.

Why

Premature optimization is usually weaker than targeted optimization backed by measurement.

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