Senior SOLID

How do you refactor legacy code to follow SOLID principles?

  • Identify classes violating SRP and break them down.
  • Introduce abstractions and interfaces to decouple components (DIP).
  • Replace conditional logic with polymorphism to respect OCP.
  • Split large interfaces (ISP).
  • Check inheritance hierarchies to maintain LSP.
  • Inject dependencies instead of direct instantiation.
  • Incrementally refactor with unit tests to ensure behavior remains consistent.

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