ng interface

Angular (ng) Interface:

Angular is a TypeScript-based open-source front-end web application framework developed by Google. It's used for building dynamic, single-page web applications (SPAs) where the content is loaded dynamically and the page does not reload during user interactions.

1. Components:typescriptCopy codeimport { Component } from '@angular/core';
   
   @Component({
   selector: 'app-root',
   template: '<h1>Hello, {{ name }}!</h1>',
   styles: ['h1 { color: blue; }']
   })
   export class AppComponent {
   name = 'Angular';
   }
   
   • The fundamental building blocks in Angular are components. Components are TypeScript classes that interact with the HTML view and handle the business logic.
   • Components are typically defined with the @Component decorator in Angular, specifying metadata such as the template, styles, and other properties.
2. Modules:typescriptCopy codeimport { NgModule } from '@angular/core';
   import { AppComponent } from './app.component';
   
   @NgModule({
   declarations: [AppComponent],
   imports: [],
   bootstrap: [AppComponent]
   })
   export class AppModule { }
   
   • Angular applications are modular, and functionality is organized into modules. A module is a logical grouping of components, services, directives, and pipes.
   • The @NgModule decorator is used to define a module, and it specifies which components belong to that module.
3. Services:typescriptCopy codeimport { Injectable } from '@angular/core';
   
   @Injectable({
   providedIn: 'root',
   })
   export class DataService {
   // Service logic here
   }
   
   • Services are used for organizing and sharing code across components. They are typically singleton instances that can be injected into components.
   • The @Injectable decorator is used to define a service.
4. Directives:typescriptCopy codeimport { Directive, ElementRef, Input } from '@angular/core';
   
   @Directive({
   selector: '[appHighlight]'
   })
   export class HighlightDirective {
   constructor(el: ElementRef) {
   el.nativeElement.style.backgroundColor = 'yellow';
   }
   }
   
   • Directives are instructions in the DOM that modify its structure or behavior. Angular has built-in directives (like *ngIf and *ngFor) and allows you to create custom directives.
5. Dependency Injection:typescriptCopy codeimport { Component } from '@angular/core';
   import { DataService } from './data.service';
   
   @Component({
   selector: 'app-root',
   template: '<h1>{{ data }}</h1>',
   })
   export class AppComponent {
   data: string;
   
   constructor(private dataService: DataService) {
   this.data = dataService.getData();
   }
   }
   
   • Angular uses a dependency injection system to provide components, services, and other objects with their dependencies.
   • The Angular injector is responsible for creating and injecting dependencies.
6. Templates and Data Binding:typescriptCopy codeimport { Component } from '@angular/core';
   
   @Component({
   selector: 'app-root',
   template: '<h1>{{ title }}</h1>',
   })
   export class AppComponent {
   title = 'Hello, Angular!';
   }
   
   • Angular uses templates to define the HTML structure of components. Data binding allows synchronization between the model (component) and the view (template).