The Single Responsibility Principle (SRP) in Angular and TypeScript

The Single Responsibility Principle (SRP) is a foundational concept in software design, emphasizing that a class, function, or module should have only one reason to change.

This principle, formulated by Robert C. Martin, states:

“A class should have only one reason to change.”

In an Angular and TypeScript context, this means structuring components, services, and modules in a way that ensures each has a single, well-defined responsibility. This improves maintainability, reduces complexity, and enhances testability.

Key Takeaways

• A class or function should be responsible for only one thing.
• Separation of concerns makes the codebase easier to maintain.
• Focused classes improve code reusability.
• Reduces unexpected side effects when modifying code.

Understanding SRP in Angular with an Example

To illustrate SRP in practice, let’s examine a common anti-pattern: a service that handles both data retrieval and logging within the same class.