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Angular 2 – Metadata ”; Previous Next Metadata is used to decorate a class so that it can configure the expected behavior of the class. Following are the different parts for metadata. Annotations − These are decorators at the class level. This is an array and an example having both the @Component and @Routes decorator. Following is a sample code, which is present in the app.component.ts file. @Component ({ selector: ”my-app”, templateUrl: ”app/app.component.html” }) The component decorator is used to declare the class in the app.component.ts file as a component. Design:paramtypes − These are only used for the constructors and applied only to Typescript. propMetadata − This is the metadata which is applied to the properties of the class. Following is an example code. export class AppComponent { @Environment(‘test’) appTitle: string = ”Welcome”; } Here, the @Environment is the metadata applied to the property appTitle and the value given is ‘test’. Parameters − This is set by the decorators at the constructor level. Following is an example code. export class AppComponent { constructor(@Environment(‘test’ private appTitle:string) { } } In the above example, metadata is applied to the parameters of the constructor. Print Page Previous Next Advertisements ”;