Decorators are a TypeScript feature, and they are implemented as functions. The decorator name begins with @ symbol followed by bracket and arguments, whereas decorators are only functions in TypeScript.
Decorators are functions simply return functions. These functions supply metadata about a given class, property, value or method to Angular.
On runtime, decorators are invoked.
Decorators allow the execution of functions. For example @Component executes the function of the component imported from Angular.
Following are some of the commonly used decorators in Angular:
- @NgModule() Specifies Angular module.
- @Component() Specifies Angular Components class.
- @Injectable() to define services.
- @Input() and @Output() to define properties that send and receive data from the DOM.
Types of Decorators in Angular
- Class Decorators, eg. @Component and @NgModule
- Property Decorators for properties inside classes, eg. @Input and @Output
- Method Decorators: For method inside classes, eg. @HostListner
- Parameter Decorators: Used for parameters inside class constructors, eg. @Inject
In Angular each decorators have its own unique role.
We use Component decorator as:
@Component(
selector:’root-comp’,
templete:’ Home Template ‘)
export class HomeComponent
{}
@NgModule({
declarations: [
AppComponent,
],
imports: [
BrowserModule,
AppRoutingModule,
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
Wrapping Words!
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