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7/10/2026
SOLID principles explained with TypeScript code examples

SOLID principles explained with TypeScript code examples

Original: SOLID

Short summary

A beginner-friendly walkthrough of SOLID design principles with TypeScript code examples. Covers Single Responsibility (avoid God Classes), Open/Closed (extend via interfaces not conditionals), Liskov Substitution (proper inheritance hierarchies), and Interface Segregation (split fat interfaces). The article is truncated before covering Dependency Inversion.

  • •Single Responsibility: avoid God Classes by separating validation, persistence, and notification concerns
  • •Open/Closed: use interfaces for extension instead of modifying existing code with new conditionals
  • •Liskov Substitution and Interface Segregation: design inheritance and interfaces that don't force unnecessary methods

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