Type Hints · interview question

What is the healthiest performance judgment around optional and collections?

Multiple choiceMediumchapter-10-curatedpremiumtype-hintsoptional-and-collections

python

from typing import Optional

def normalize_coupon(code: Optional[str]) -> str:
    return code or ""

Solve the symptom with comments only and avoid changing the code shape around optional and collections.Keep optional and collections implicit so the script stays short and hope the next engineer infers the rule.Delay clarity until production traffic reveals the edge case and then patch it under pressure.Measure before optimizing, then change the part that actually dominates cost instead of guessing from style alone.

Answer and explanation

Correct answer

D. 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.

Test yourself on Type Hints

A free test with instant, explained results. No account needed.

Start free test

All Type Hints questions →

What is the healthiest performance judgment around optional and collections?

Correct answer

Why

More Type Hints questions