Writing Clean Code: SOLID & DRY Principles for Beginners
An introduction to writing parseable, testable, and scalable code in JavaScript & TypeScript.
Writing code is easy, but writing maintainable, testable software requires following structured engineering principles.
1. DRY (Don't Repeat Yourself): Abstract duplicated business logic into reusable helper functions, hooks, or shared utility modules.
2. Single Responsibility Principle (SRP): Each function, class, or React component should have one, and only one, reason to change.
3. Open/Closed Principle: Software entities should be open for extension but closed for modification through clean interfaces and composition.
4. Meaningful Naming & Self-Documenting Code: Write intuitive variable and function names that explain their intent without needing excessive inline comments.
5. Write Meaningful Unit Tests: Complement clean code architecture with Jest/Vitest unit tests to guarantee regression safety.