🚀 10 Angular Hacks Every Developer Should Know

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🔥 Boost Productivity & Supercharge Performance

Angular is a powerful framework for building scalable web applications, but it can sometimes feel complex and slow if not optimized correctly. Here are 10 Angular hacks to improve your development workflow, enhance performance, and write cleaner code.

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1. Use trackBy in *ngFor for Performance Optimization ⚡

When rendering lists with *ngFor, Angular re-renders the entire list whenever an item changes. This can be costly in performance. Use trackBy to optimize this behavior:

<li *ngFor="let user of users; trackBy: trackById">{{ user.name }}</li>

trackById(index: number, item: any): number {
  return item.id;
}

Why? This ensures that Angular only updates items that change instead of re-rendering the entire list.

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2. Lazy Load Modules to Improve Page Speed 🚀

Instead of loading all modules at startup, load them only when needed using lazy loading:

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

Why? This significantly improves initial load time by reducing the JavaScript bundle size.

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3. Use OnPush Change Detection Strategy 📈

By default, Angular’s change detection runs on every component state change. Optimize it using ChangeDetectionStrategy.OnPush:

import { ChangeDetectionStrategy, Component } from '@angular/core';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class ExampleComponent {}

Why? This tells Angular to only check for changes when the component’s inputs change, leading to better performance.

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4. Debounce User Input to Prevent Excess API Calls ⏳

Instead of sending API calls on every keystroke, use debounceTime from RxJS:

searchSubject.pipe(
  debounceTime(300),
  distinctUntilChanged()
).subscribe(value => this.search(value));

Why? Reduces unnecessary API calls, improving efficiency and responsiveness.

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5. Use Angular Resolvers for Preloading Data ⏩

Instead of loading data inside components, use resolvers to fetch data before navigating to a route:

@Injectable({ providedIn: 'root' })
export class UserResolver implements Resolve<User> {
  constructor(private userService: UserService) {}
  resolve(): Observable<User> {
    return this.userService.getUser();
  }
}

Why? Ensures that the component has the required data before rendering, improving user experience.

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🎯 Conclusion

By applying these Angular hacks, you can significantly boost performance, improve user experience, and streamline development. Whether you’re optimizing change detection, reducing API calls, or lazy-loading modules, these small tweaks can make a big difference.

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