Lazy loading in Angular is a technique used to improve the performance of your application by loading feature modules only when they are needed. This can significantly reduce the initial load time of your application, as it avoids loading all the modules upfront.

How Lazy Loading Works

In Angular, lazy loading is typically implemented using the Angular Router. Instead of loading all the modules at once, you configure the router to load certain modules only when a specific route is accessed.

Steps to Implement Lazy Loading

1. Create a Feature Module: First, create a feature module that you want to load lazily. For example, let's create a UserModule.
   

   ng generate module user --route user --module app.module
   

2. Configure Routes: In your AppRoutingModule, configure the route to use lazy loading. Use the loadChildren property to specify the path to the module.
   

   const routes: Routes = [
     {
       path: 'user',
       loadChildren: () => import('./user/user.module').then(m => m.UserModule)
     }
   ];
   

3. Set Up the Feature Module: In the UserModule, set up the routes specific to this module.
   

   import { NgModule } from '@angular/core';
   import { RouterModule, Routes } from '@angular/router';
   import { UserComponent } from './user.component';
   
   const routes: Routes = [
     { path: '', component: UserComponent }
   ];
   
   @NgModule({
     imports: [RouterModule.forChild(routes)],
     exports: [RouterModule]
   })
   export class UserRoutingModule { }
   

4. Load the Module: When the user navigates to the /user route, Angular will load the UserModule on demand.

Benefits of Lazy Loading

• Improved Performance: Reduces the initial load time by loading only the necessary modules.
• Better User Experience: Users can start interacting with the application faster.
• Efficient Resource Usage: Loads resources only when needed, which can be particularly beneficial for large applications.

Example Scenario

Imagine you have an e-commerce application with several modules like Home, Products, Cart, and User. By implementing lazy loading, you can ensure that the Cart and User modules are only loaded when the user navigates to those sections, rather than loading everything upfront.

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