Angular Modules

In Angular, modules play a crucial role in organizing and structuring an application into cohesive blocks of functionality.

Angular modules are TypeScript classes with an "@NgModule" decorator, which provides metadata that Angular needs to compile and run the application.

Modules In Brief:

Purpose: Modules help organize our application into functional units, making it easier to manage, maintain, and scale. They enable modularity, encapsulation, and reusability, allowing us to create large and complex applications with ease.
Definition: An Angular module is a cohesive block of code with a related set of capabilities. It encapsulates the components, directives, pipes, services, and other pieces of code that are related to a specific feature, workflow, or functionality within our application.

Types of Modules:

Root Module:

The root module serves as the entry point of our application. It is responsible for bootstrapping the application and orchestrating the initialization process.

Routing Module:

The routing module is responsible for defining the routes and navigation paths within our application. It maps URLs to components, allowing users to navigate between different views and pages. The routing module is typically imported into the root module and used to configure the application's routing configuration.

Feature Modules:

Feature modules are additional modules created to encapsulate specific features or functionality within an application.

They help in organizing the application and keeping related components, directives, and services together.

Shared Modules:

Shared modules are modules used to export and share common components, directives, and pipes across multiple feature modules

Here's a breakdown of Angular modules and their key features:

NgModule Decorator:

The @NgModule decorator is used to define an Angular module.
It takes a metadata object that specifies various aspects of the module, such as declarations, imports, providers, and bootstrap components.

Declarations:

Declarations are an array of components, directives, and pipes that belong to the module.
Components declared in the module can be used in the module's templates.

Imports:

Imports are an array of other modules that this module depends on.
It allows modules to use components, directives, and pipes from other modules.

Providers:

Providers are an array of services that are available within the module.
Services provided in the module are available for injection into components and other services within the same module.

Bootstrap:

Bootstrap is an array of components that are automatically instantiated when the module is bootstrapped.
Typically, the bootstrap array contains the root component of the application.

Example of Module Definition:

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 { }

Note:

"AppModule" is the root module of the application.
It declares the "AppComponent".
It imports "BrowserModule" to access common directives such as "ngIf" and "ngFor".
There are no providers specified in this example, but we can add services to the providers array.

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