Anil Singh | Code-sample.com

What Are decorators? The Decorators are functions that modify JavaScript classes and it also used for attaching metadata to classes. Directive decorator and metadata Properties - @ Directive ({     selector? : string     inputs ?: string []     outputs ?: string []     host ?: {...}     providers ?: Provider []     exportAs ?: string     queries ?: {...} }) Selector – It is a CSS selector that tells Angular to create an instance of this component wherever it finds the corresponding tag in template HTML. For example, it is – < app-login ></ app-login > CSS selector also triggers the instantiation of a directive. The selector may be declared by element name, class name, attribute name, and attribute name & value. Suppose we have a directive with an <input type="checkbox"> selector and the HTML looks like this. < fo...