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The Single Responsibility Principle (SRP) in Angular and TypeScript

Vítor Azevedo
JavaScript in Plain English
4 min read5 days ago

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.

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Published in JavaScript in Plain English

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Written by Vítor Azevedo

Frontend Developer with 25+ years' expertise in HTML, CSS, JavaScript, Angular and Vue. Builds dynamic, user-centric web apps. Award-winning projects.

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Nice article