10 Tips for Building Reusable Angular Components
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José Matos

19 Mar 2023

10 Tips for Building Reusable Angular Components

    10 Tips for Building Reusable Angular Components

    Angular is one of the most popular web development frameworks around. It is known for its efficiency, flexibility and easy-to-use functionality. One of the key features of Angular is its use of components. Angular components are the building blocks of Angular applications. They allow developers to build large, complex applications by breaking them down into smaller, reusable pieces. In this article, I will offer some tips on how to build reusable Angular components.

    1. Keep components small and focused

    A reusable component should be designed with a single purpose in mind. This means keeping the code as small and focused as possible. A component that tries to do too much may be hard to understand and difficult to reuse. When designing components, consider the Single Responsibility Principle (SRP) to ensure that the component has a clear and focused purpose.

    2. Create a clear API

    A clear API is critical to making a component easy to use, test, and debug. The API defines how the component interacts with the rest of the application. The more straightforward and intuitive the API, the easier it will be for developers to use the component in their own code. Make sure to document the API in a clear and concise manner.

    3. Use input and output properties

    Angular components can use input and output properties to interact with other components or services. Inputs allow you to pass data into a component, while outputs allow you to emit events from the component. Using these properties makes components more flexible and easier to reuse. Make sure to create input and output properties that are easy to understand and well documented.

    4. Use custom events

    Custom events can be used to communicate between components in Angular. Use custom events to add interactivity to your components, allowing them to take action based on user input or other events. Make sure to document your custom events and provide clear examples of how they can be used in other applications.

    5. Use lifecycle hooks

    Angular components have a set of lifecycle hooks that allow you to perform actions at specific points in the component's lifetime. For example, you can use the ngOnInit hook to perform initialization tasks when the component is created. Understanding and using these hooks can make your components more robust and easier to use.

    6. Use dependency injection

    Dependency injection is an important concept in Angular that allows you to inject dependencies into a component. Dependencies can include other services, components or modules. By using dependency injection, you can keep your code modular and flexible, making it easier to test and reuse. When creating a component, consider whether it needs any dependencies and inject them accordingly.

    7. Use templates

    Templates are an important part of Angular components, allowing you to define the HTML structure of the component. By using templates, you can separate the presentation logic from the business logic of the component. This makes your components more flexible and easier to maintain. Consider using templates to simplify your components and make them more reusable.

    8. Use CSS encapsulation

    CSS encapsulation is an important feature of Angular that allows you to define styles for a component that do not affect other components on the page. This makes your components more robust and easier to style. Consider using CSS encapsulation to simplify your components and make them more flexible.

    9. Test your components

    Testing is an important part of web development, and Angular provides a powerful testing framework. When building reusable components, it is important to test them thoroughly to ensure that they work as expected. Write tests that cover all the functionality of the component, including edge cases and error conditions. Use the Angular testing framework to simplify the testing process.

    10. Document your components

    Finally, it is important to document your components thoroughly. This includes adding comments to your code, writing clear and concise documentation, and providing examples of how to use the component. Good documentation makes it easier for other developers to use your components and helps ensure that your code is maintainable over time.


    In conclusion, building reusable Angular components requires careful planning and attention to detail. By following these tips, you can create components that are flexible, robust, and easy to use in a variety of different applications. Remember to keep your components small and focused, create a clear API, use input and output properties, use custom events, use lifecycle hooks, use dependency injection, use templates, use CSS encapsulation, test your components, and document your components thoroughly. With these tips in mind, you can build reusable components that will simplify your code and make your applications more powerful and effective.

    © 2023 Designed & Developed by José Matos.