A comprehensive walkthrough of the five SOLID principles (Single Responsibility, Open-Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion) with TypeScript code examples. Each principle is explained with practical scenarios like email service swapping and employee payroll systems, showing both violations and correct implementations. The post also touches on when SOLID can be over-applied and notes the challenges of applying these principles in plain JavaScript without interfaces.
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