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In respect to this, what are the decorators in angular 4?

Decorators are a new feature of TypeScript and used throughout the Angular code, but they are nothing to be scared of. With decorators we can configure and customise our classes at design time. They are just functions that can be used to add meta-data, properties or functions to the thing they are attached to.

Likewise, what are decorators in angular 2? Decorators are functions that are invoked with a prefixed @ symbol, and immediately followed by a class , parameter, method or property. The decorator function is supplied information about the class , parameter or method, and the decorator function returns something in its place, or manipulates its target in some way.

Regarding this, why decorators are used in angular?

Class Decorators They allow us to tell Angular that a particular class is a component, or module, for example. And the decorator allows us to define this intent without having to actually put any code inside the class. No code is needed within the class to tell Angular that it is a component or a module.

What are decorators and directives in angular?

In Angular, a Directive is essentially a typescript class which has been annotated with a TypeScript Decorator. The decorator is the @ symbol. Decorators are not currently part of the JavaScript functionality (although they likely will be in the future) and are also still experimental in TypeScript.