What is a Module in Angular?
💡 Concept Name
NgModule – An Angular module helps group related components, directives, pipes, and services into cohesive blocks.
📘 Quick Intro
In Angular, modules are containers for different parts of your app. They help with organizing and bootstrapping the app. Every Angular app has at least one root module called AppModule.
🧠 Analogy / Short Story
Think of an Angular module like a toolbox. You can group all your related tools (components, services, directives) in one box (module) so that everything needed for a specific job is neatly packaged together.
🔧 Technical Explanation
- 📦 Declares components, directives, and pipes that belong to the module.
- 🔗 Imports other modules to use their features.
- 🚀 Bootstraps the root component of the application.
- 🔒 Provides services that can be injected via DI.
- 🧩 Helps with code organization, especially in large apps.
🎯 Purpose & Use Case
- ✅ Organize and encapsulate functionality.
- ✅ Split application into feature modules.
- ✅ Use lazy loading for performance.
- ✅ Reuse modules across multiple apps.
💻 Real Code Example
// app.module.ts
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 {{ }}
❓ Interview Q&A
Q1: What is an Angular module?
A: A container for a group of components, directives, pipes, and services.
Q2: What is the root module of every Angular app?
A: AppModule.
Q3: Can modules be loaded lazily in Angular?
A: Yes, via Angular routing configuration.
Q4: What decorator defines a module?
A: @NgModule.
Q5: What are declarations in a module used for?
A: To declare components, directives, and pipes that belong to the module.
💡 Bonus Insight
It's a best practice to create feature modules for larger apps (e.g., UserModule, AdminModule). This promotes reusability and helps enable lazy loading for better performance.
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