Design patterns · interview question
Which signal most strongly shows that a design pattern is actually justified in a checkout codebase?
Multiple choiceEasychapter-13-curatedpremiumdesign-patternspattern-abuse
Answer and explanation
Correct answer
B. One part of the code keeps changing independently of the rest of the system.
Why
Patterns are most useful when they isolate a real axis of change. If shipping rules, vendor integrations, or post-checkout reactions keep evolving separately, the abstraction localizes those changes and pays for itself.
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