Angular Best Practices

we will cover essential best practices for Angular development, ensuring your application is maintainable, performant, and scalable. Adhering to these practices will help you optimize your Angular projects for better performance, efficient organization, and easier testing.

1. Folder Structure and File Organization

A well-organized folder structure is key to maintaining and scaling your Angular applications. Here are some recommended practices for structuring your project:

1.1. Grouping by Features

Instead of organizing files by type (e.g., placing all components in one folder, services in another), organize by feature or module. This keeps related files together and makes it easier to maintain large codebases.

• App Folder Structure:

/src/app
  ├── /core             # Core services and singleton components (e.g., AuthenticationService)
  ├── /shared           # Shared components, directives, and pipes
  ├── /feature-modules  # Feature-specific modules and components (e.g., Dashboard, User)
  ├── /models           # Interfaces and models
  ├── /services         # Shared services that are used across multiple components        

1.2. Using Feature Modules

Break your app into feature modules. This promotes modularity and helps with performance through lazy loading.

ng generate module feature-name        

• Example: A User module might have its components, services, and models in its own directory (/src/app/user).

1.3. Separate Core and Shared Modules

• Core Module: This module should contain singleton services (services that should have a single instance) such as authentication, guards, or HTTP interceptors.
• Shared Module: This should contain reusable components, pipes, and directives that can be shared across multiple feature modules.

2. Performance Optimization Tips

Optimizing the performance of Angular applications is crucial, especially for large-scale projects. Below are some tips to keep your app fast and responsive:

2.1. Lazy Loading

Lazy loading allows you to load feature modules on demand, reducing the initial load time of the application.

• How to Implement Lazy Loading: Define routes in the app-routing.module.ts that load modules lazily using loadChildren:

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

This ensures that the UserModule is only loaded when the user navigates to the “user” route, improving performance on the initial load.

2.2. Use OnPush Change Detection

The default change detection strategy in Angular checks for changes in all components on every data change. This can negatively impact performance in large applications. Using the OnPush strategy can help optimize change detection.

• How to Use OnPush: In the component decorator, set the change detection strategy to OnPush

Read More: https://www.hqledutech.com/angular-best-practices/