Angular Architecture
💡 Concept Name
Angular Architecture – The structural design of an Angular application which uses components, modules, services, routing, and dependency injection.
📘 Quick Intro
Angular architecture is based on the modular approach where the application is split into reusable components, managed by NgModules. It uses TypeScript, RxJS, dependency injection, and services to build dynamic SPAs (Single Page Applications).
🧠 Analogy / Short Story
Think of Angular like a smart city. Components are buildings, services are utility providers, routing is the city’s road system, and modules are neighborhoods that organize the buildings for functionality and scalability.
🔧 Technical Explanation
- 🏗️ Components: Building blocks with HTML, CSS, and TypeScript logic.
- 📦 Modules: Logical containers for components, directives, and services.
- 🔁 Services: Provide reusable business logic and data communication.
- 🚦 Routing: Allows navigation between views/pages using URLs.
- 🧠 DI: Angular uses dependency injection for managing services and objects.
- 🧩 Other elements: Pipes, Directives, Observables (RxJS) enhance flexibility.
🎯 Purpose & Use Case
- ✅ Build scalable SPA applications
- ✅ Reuse UI and logic across multiple modules
- ✅ Create maintainable enterprise applications
- ✅ Apply MVC-like separation with loosely-coupled architecture
- ✅ Handle routing, state, and data flow efficiently
💻 Real Code Example
// app.module.ts
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { HomeComponent } from './home/home.component';
import { AboutComponent } from './about/about.component';
import { RouterModule } from '@angular/router';
@NgModule({
declarations: [AppComponent, HomeComponent, AboutComponent],
imports: [
BrowserModule,
RouterModule.forRoot([
{ path: '', component: HomeComponent },
{ path: 'about', component: AboutComponent }
])
],
bootstrap: [AppComponent]
})
export class AppModule { }
❓ Interview Q&A
Q1: What is the core building block of Angular apps?
A: Components.
Q2: What does NgModule do?
A: Organizes related code into functional units.
Q3: What is the role of services in Angular?
A: Encapsulate reusable business logic and data access.
Q4: What manages view navigation in Angular?
A: Angular Router.
Q5: What is dependency injection used for?
A: Efficiently manage dependencies and reduce coupling.
📝 MCQs
Q1. What is the primary role of a component in Angular?
- To configure routing
- To define the UI and behavior
- To serve data
- To compile modules
Q2. Which Angular feature handles navigation?
- FormsModule
- BrowserModule
- HttpClientModule
- RouterModule
Q3. What is used to inject services in Angular?
- Template Binding
- Routing
- Dependency Injection
- Pipes
Q4. Which file defines Angular module metadata?
- main.ts
- component.ts
- index.html
- app.module.ts
Q5. What is the default root component in an Angular app?
- HomeComponent
- AppComponent
- MainComponent
- RootComponent
💡 Bonus Insight
Angular uses a unidirectional data flow and change detection system to optimize UI updates. Advanced topics like lazy loading and feature modules further enhance scalability.
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