This content originally appeared on DEV Community and was authored by Dipak Ahirav
Optimizing the performance of your Angular application is crucial for providing a smooth user experience. Here are 10 best practices to help you get the most out of your Angular apps.
please subscribe to my YouTube channel to support my channel and get more web development tutorials.
1. OnPush Change Detection Strategy đź§
By default, Angular uses the Default change detection strategy, which checks all components for changes. Using the OnPush strategy reduces the number of checks by only checking components when their inputs change.
@Component({
selector: 'app-my-component',
templateUrl: './my-component.component.html',
changeDetection: ChangeDetectionStrategy.OnPush
})
export class MyComponent {
@Input() data: any;
}
2. Use TrackBy with ngFor 🔄
Using trackBy in ngFor helps Angular identify items in a list, reducing the number of DOM manipulations.
<div *ngFor="let item of items; trackBy: trackByFn">
{{ item.name }}
</div>
trackByFn(index, item) {
return item.id;
}
3. Lazy Loading Modules 📦
Lazy loading modules ensures that only the necessary parts of your application are loaded, reducing the initial load time.
const routes: Routes = [
{
path: 'feature',
loadChildren: () => import('./feature/feature.module').then(m => m.FeatureModule)
}
];
4. Optimize Template Expressions 🖋️
Avoid complex calculations and function calls in template expressions. Instead, compute values in the component class and bind them to the template.
<!-- Instead of this -->
<div>{{ computeHeavyTask() }}</div>
<!-- Use this -->
<div>{{ computedValue }}</div>
ngOnInit() {
this.computedValue = this.computeHeavyTask();
}
5. Use AOT Compilation 🛠️
Ahead-of-Time (AOT) compilation pre-compiles your Angular templates and components, resulting in faster rendering and smaller bundle sizes.
ng build --prod --aot
6. Optimize Styles and Scripts Loading 🎨
Load styles and scripts conditionally to reduce the initial load. Use ngStyle and ngClass for conditional styling.
<div [ngClass]="{'class-a': conditionA, 'class-b': conditionB}"></div>
7. Use Pure Pipes for Data Transformation đź“Š
Pure pipes are stateless and only recalculate when their input arguments change, making them more efficient than impure pipes.
@Pipe({ name: 'purePipe', pure: true })
export class PurePipe implements PipeTransform {
transform(value: any, ...args: any[]): any {
// Transformation logic
}
}
8. Minimize the Use of Third-Party Libraries đź“š
Only include necessary third-party libraries and remove unused ones. This reduces the bundle size and improves load times.
npm prune
9. Optimize Images and Assets 🖼️
Use optimized images and lazy load them to improve performance. Tools like ImageOptim or online services can help reduce image sizes.
<img [src]="imageSrc" loading="lazy" />
10. Avoid Memory Leaks 🧹
Unsubscribe from Observables and detach event listeners to prevent memory leaks.
@Component({
selector: 'app-my-component',
templateUrl: './my-component.component.html'
})
export class MyComponent implements OnDestroy {
private subscription: Subscription;
ngOnInit() {
this.subscription = this.myService.getData().subscribe();
}
ngOnDestroy() {
this.subscription.unsubscribe();
}
}
By following these best practices, you can optimize the performance of your Angular applications, providing a better experience for your users. Happy coding! 🚀
Feel free to leave your comments or questions below. If you found this guide helpful, please share it with your peers and follow me for more web development tutorials. Happy coding!
Follow and Subscribe:
- Website: Dipak Ahirav
- Email: dipaksahirav@gmail.com
- YouTube: devDive with Dipak
- LinkedIn: Dipak Ahirav
This content originally appeared on DEV Community and was authored by Dipak Ahirav
Dipak Ahirav | Sciencx (2024-07-17T02:22:02+00:00) 10 Best Practices for Optimizing Angular Performance. Retrieved from https://www.scien.cx/2024/07/17/10-best-practices-for-optimizing-angular-performance/
Please log in to upload a file.
There are no updates yet.
Click the Upload button above to add an update.