let x = 5;
function foo() {
  // code here
}

Good Example:

let retryLimit = 5;
function getUserData() {
  // code here
}

2. Avoid Deep Nesting

Deeply nested code can be hard to follow. keep your code as flat as possible by returning early from functions when conditions aren't met.

Bad Example: 

if (condition1) {
  if (condition2) {
    if (condition3) {
      // logic here
    }
  }
}

Good Example:

if (!condition1 || !condition2 || !condition3) return;
// logic here

3. Use Angular Services for API Calls

Instead of writing API calls directly in your components, separate the logic by placing API calls in services. This makes your code more reusable and improves performance.

Bad Example: 

// In component.ts
this.http.get('/api/users').subscribe(...);

Good Example:

// In user.service.ts
getUserData() {
  return this.http.get('/api/users');
}
// In component.ts
this.userService.getUserData().subscribe(...);

4. Optimize Change Detection

Use the OnPush change detection strategy for components that don’t need to constantly check for changes. This reduces unnecessary work and improves performance.

@Component({
  selector: 'app-user',
  changeDetection: ChangeDetectionStrategy.OnPush
})

5. Lazy Load Your Modules

For large applications, it’s better to load only the parts that are needed at a specific time. You can do this by lazy loading your modules.

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

Performance and Clean Code in Numbers

Comparison with Other Frameworks

Angular has a strong built-in architecture, making it easier to follow clean code practices compared to React or Vue.js.

Conclusion

Writing clean code in Angular isn’t just about making your code easier to read. It’s a powerful way to improve the performance, scalability, and maintenance of your application. A clean architecture helps remove bottlenecks, keeps your app performing at its best, and ensures your code remains manageable as your app grows.

Want to improve the performance of your Angular apps with clean code practices? Contact us today at Sparkle Web for expert help in building fast, scalable, and easy-to-maintain applications!