Walk a type switch toward polymorphism
Refactor a repeated type conditional toward polymorphic behavior safely.
The situation A new pricing plan is coming, and plan-type conditionals already exist in billing, onboarding, and alerting. Every new type now edits old workflows, which is exactly the change pattern polymorphism can isolate. Refactoring path Replace Conditional with Polymorphism Do not rewrite the whole plan model. Find the repeated variation, pin current behavior with tests, move one responsibility behind a role, then expand. Shortcut Big-bang hierarchy rewrite New plan behavior becomes additive instead of scattered. Use polymorphism when alternatives vary by type and that variation repeats. 01 Find 02 Protect 03 Move Step 1 You find three plan.type branches.…
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