Summary

In this chapter, you learned about the following topics:

• Code smells and the importance of refactoring code
• SOLID design principles:
  
  • Single responsibility principle
  • Open closed principle
  • Liskov substitution
  • Interface segregation
  • Dependency injection

• Various code smells:
  • Comments smell
  • Long method
  • Long parameter list
  • Duplicate code
  • Conditional complexity
  • Large class
  • Dead code

• Object-oriented code smells' primitive obsession
  • Data class
  • Feature envy

You also learned about many refactoring techniques that will help you maintain your code cleaner. Happy coding!