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Domain Modeling · interview question

A bug appears around properties and encapsulation. What is the strongest first debugging move?

Multiple choiceHardchapter-7-curatedpremiumdomain-modelingproperties-and-encapsulation
python
class InventoryItem:
    def __init__(self, stock: int) -> None:
        self._stock = stock

    @property
    def stock(self) -> int:
        return self._stock
Choose one answer
Answer and explanation

Correct answer

B. Trace one concrete example, inspect the state transitions, and compare them to the intended rule before rewriting anything.

Why

That approach is reliable because it creates evidence. Blindly exposing mutable internal fields invites invalid state transitions later.

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