Angular Interview Practice

How does Angular use component selectors in templates?

1. By ignoring component selectors to improve performance.

2. By replacing matching selectors with the component's view.

3. By creating directives from component selectors.

4. By compiling templates without matching any selectors.

The correct answer is: By replacing matching selectors with the component's view.

In Angular, component selectors play a critical role in how templates are defined and rendered. When a selector is used in a template, Angular recognizes the selector and replaces it with the corresponding component's view. This mechanism allows developers to include custom components seamlessly within their templates, enabling a modular approach to building applications. When Angular encounters a component selector in the HTML, it effectively creates an instance of that component within the parent component's view. This instantiation means that all the data binding, lifecycle hooks, and other features provided by Angular's component architecture are applied, allowing for dynamic interactions and updates based on user interactions or changes in application state. The process of matching the selector with the component's template enables encapsulation of functionality and styling, as the component may have its own specific logic, styles, and external dependencies. This modularity promotes reusability, making it easier to manage and maintain applications as they grow in complexity. This clear association between selectors and their respective components is fundamental to Angular's component-driven development paradigm.