Angular architecture is built around several fundamental components that work together to create robust and scalable web applications. These components include modules, components, services, and directives.
Modules: Modules in Angular serve as containers for organizing code into cohesive units. They group related components, services, directives, and other Angular features. Modules help maintain modularity, reusability, and separation of concerns within an application. Angular applications typically have at least one root module, which serves as the entry point for bootstrapping the application, and may have additional feature modules for organizing related functionality.
Components: Components are the building blocks of Angular applications. Each component encapsulates a specific part of the user interface and behavior, consisting of HTML templates, CSS styles, and TypeScript code. Components are reusable and composable, allowing developers to create complex UIs by combining smaller, self-contained components. Angular applications are composed of a hierarchy of components, with each component responsible for rendering a portion of the application's UI and managing its behavior.
Services: Services in Angular are singleton objects that encapsulate reusable logic and data that can be shared across multiple components. Services provide a way to centralize common functionality, such as data fetching, authentication, and business logic. They promote code reuse, maintainability, and testability by separating concerns and keeping components focused on presenting data and responding to user interactions. Services are typically injected into components and other services using Angular's dependency injection mechanism.
Directives: Directives are a powerful feature in Angular that allow developers to extend HTML with custom behavior and functionality. There are two types of directives in Angular: structural directives and attribute directives. Structural directives, such as *ngIf and *ngFor, modify the structure of the DOM by adding or removing elements based on conditions. Attribute directives, such as ngModel and ngStyle, manipulate the behavior or appearance of existing elements. Directives enable developers to create dynamic and interactive UIs by adding custom behavior to HTML elements.
In summary, modules, components, services, and directives are the fundamental components of Angular architecture. Understanding how these components work together is essential for building scalable, maintainable, and efficient Angular applications.
