Angular Architecture Overview

1. Introduction

Angular is a platform for building mobile and desktop web applications. It provides a comprehensive solution for developing applications with a clear architecture.

2. Key Concepts

3. Modules

Angular applications are modularized into NgModules. Each module is a cohesive block of code that organizes related functionalities.

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

4. Components

Components are the fundamental building blocks of Angular applications. Each component consists of a TypeScript class, an HTML template, and a CSS stylesheet.

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'my-app';
}

5. Services

Services in Angular are used to encapsulate business logic and data fetching mechanisms. They promote reusability across components.

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class DataService {
  getData() {
    return ['item1', 'item2', 'item3'];
  }
}

6. Routing

Angular's routing module enables navigation between different views or components in a single-page application.

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { HomeComponent } from './home/home.component';
import { AboutComponent } from './about/about.component';

const routes: Routes = [
  { path: '', component: HomeComponent },
  { path: 'about', component: AboutComponent }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

7. Best Practices

To ensure maintainability and scalability, follow these best practices:

• Use Angular CLI for project setup and management.
• Organize components within feature modules.
• Leverage lazy loading for large applications.
• Keep services stateless whenever possible.

8. FAQ

Flowchart of Angular Architecture

graph TD;
            A[Start] --> B[Modules];
            B --> C[Components];
            C --> D[Services];
            D --> E[Routing];
            E --> F[End];