Angular is a popular JavaScript framework used for building web applications. It provides a lot of functionality out of the box and comes with its own set of terminology and vocabulary. In this article, we'll cover some of the basic vocabularies of Angular that you should know to get started, as well as information about decorators.
1. Component
In Angular, a component is a building block of an application. It is a TypeScript class that encapsulates the logic and view of a particular part of the application. Each component has its own template, which defines the component's view. Components are reusable and can be composed together to build more complex applications.
To define a component in Angular, you use the @Component decorator. The decorator tells Angular that the class is a component and provides metadata about the component, such as its selector, template, and styles.
2. Template
A template is an HTML file that is associated with a component. It defines the view of the component. Templates use Angular's templating syntax, which allows you to bind data from the component to the view, and to respond to user events.
To define a template in Angular, you include it as part of the @Component decorator's metadata.
3. Directive
A directive is an instruction to Angular to do something with a DOM element. Directives can be used to add or remove elements from the DOM, to add behavior to elements, or to modify the appearance of elements. Angular comes with a set of built-in directives, such as ngIf, ngFor, and ngStyle, but you can also create your own custom directives.
To define a directive in Angular, you use the @Directive decorator. The decorator tells Angular that the class is a directive and provides metadata about the directive, such as its selector and inputs.
4. Service
A service is a class in Angular that provides a specific functionality to other parts of the application. Services are used to encapsulate common functionality that needs to be shared across different parts of the application. Services can be injected into components, other services, or directives.
To define a service in Angular, you use the @Injectable decorator. The decorator tells Angular that the class is a service and allows it to be injected into other parts of the application.
5. Module
A module is a container for a group of related components, directives, and services. Modules help to organize an application by grouping related functionality together. Each Angular application has at least one module, the root module, which is defined in the app.module.ts file.
To define a module in Angular, you use the @NgModule decorator. The decorator tells Angular that the class is a module and provides metadata about the module, such as its imports, declarations, and providers.
6. Dependency Injection
Dependency injection is a design pattern used in Angular to provide instances of classes to other classes that depend on them. When you inject a service into a component or other class, Angular creates a single instance of the service and provides it to the component or class. This makes it easy to share functionality across different parts of the application, and to swap out implementations of a service.
To inject a dependency in Angular, you use the @Injectable decorator to mark the class as a provider, and the @Inject decorator to specify the dependency that should be injected.
Conclusion
Angular has its own set of terminology and vocabulary that can be confusing at first. However, understanding these terms is essential to building Angular applications. By understanding the basic vocabulary of Angular, as well as information about decorators, you'll be able to create more complex applications and take advantage of the many features that Angular provides.
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