Skip to content

Latest commit

 

History

History
66 lines (38 loc) · 2.41 KB

README.md

File metadata and controls

66 lines (38 loc) · 2.41 KB
Raw

SOLID Principles in TypeScript

SOLID principles, envisioned by Robert C. Martin (Uncle Bob), are five guidelines for crafting robust and agile object-oriented code. While primarily targeted at object-oriented languages, these principles also translate beautifully to JavaScript's flexible nature.

Principles

1. Single Responsibility Principle (SRP)

Principle: Every class or module should have a single, well-defined responsibility.

Benefits: Improves code focus, simplifies debugging, and enhances understanding.

Implementation:

  • Break down large classes into smaller, focused ones.
  • Extract functions for specialized tasks.
  • Organize modules by functionality.

2. Open-Closed Principle (OCP)

Principle: Software entities (classes, modules) should be open for extension but closed for modification.

Benefits: Facilitates future enhancements without rewriting existing code.

Implementation:

  • Utilize inheritance and polymorphism effectively.
  • Favor composition over inheritance.
  • Employ interfaces to define contracts for behavior.

3. Liskov Substitution Principle (LSP)

Principle: Subtypes should be substitutable for their base types without altering the program's correctness.

Benefits: Ensures consistency and predictability when replacing objects.

Implementation:

  • Design subclasses to uphold the behavior and preconditions of their base types.
  • Avoid introducing new errors or side effects in subclasses.
  • Prioritize contracts (interfaces) over concrete implementations.

4. Interface Segregation Principle (ISP)

Principle: Clients should not be forced to depend on interfaces they don't use.

Benefits: Reduces coupling and improves modularity.

Implementation:

  • Break down large interfaces into smaller, specific ones.
  • Define separate interfaces for distinct functionalities.
  • Use abstract classes or mixins for shared functionality.

5. Dependency Inversion Principle (DIP)

Principle: Depend on abstractions, not concretions. High-level modules should not depend on low-level modules; both should depend on abstractions.

Benefits: Promotes loose coupling and enables flexible dependency injection.

Implementation:

  • Favor abstract classes and interfaces over concrete implementations.
  • Inject dependencies through constructor injection, property injection, or method injection.
  • Use dependency injection frameworks to manage dependencies easily.