Decorators In Angular

Injectable is an important part of any Angular service definition.

Decorators in angular. The core functionality of most angular decorators is to attach metadata to a class. The reason some people might select the wrong answer to the question above is that they misjudge the relationship between the Injectable decorator and DI in Angular not understanding what. All angular decorators use the second approach with a wrapper function.

Every type of decorator shares the same core functionality. Angular does this by using a factory for each type of decorator. Decorators are a TypeScript feature and they are implemented as functions.

Decorators in Angular 2 are used extensivelyDecorators are used to attach metadata to program elements such as class and propertiesMetadata is used to specify details about program entitiesDecorators give special meaning to program elementsHere we will look at some of the most commonly used Decorators in Angular 2. Angular has a high usage of RxJS Observables this is a reactive library for JS it is used to add event-based programming to JS. NgModule Component Injectable Directive.

If you open the appmodulets file then you will find AppModule which is the root module of the angular application. And decorators are going to be invoked at runtime. So how does angula.

From a purely decorative point of view Component and Directive both work in the same way as do Input and Output. Angular recognizes the TypeScript class as an Angular artifact with the help of decorators. On runtime decorators are invoked.

Lets look at the most common decorator in Angular the Component. In this guide you will learn about different decorators and their corresponding properties to understand how Angular identifies a simple TypeScript class as an Angular component directive pipe service or module. Decorators are a design pattern that is used to separate modification or decoration of a class without modifying the original source code.