Domain Modeling · interview question
A bug appears around instance methods. What is the strongest first debugging move?
Multiple choiceMediumchapter-7-curatedpremiumdomain-modelinginstance-methods
from dataclasses import dataclass
@dataclass
class OrderLine:
unit_price: float
quantity: int
def line_total(self) -> float:
return self.unit_price * self.quantityAnswer and explanation
Correct answer
D. 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. If every operation stays outside the object forever, the model can become a passive bag of fields.
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