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.
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1. OnPush Change Detection Strategy ๐ง
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 ๐
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 ๐ฆ
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 ๐๏ธ
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 ๐ ๏ธ
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 ๐จ
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 ๐
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 ๐
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 ๐ผ๏ธ
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 ๐งน
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();
}
}
Start Your JavaScript Journey
If you're new to JavaScript or want a refresher, visit my blog on BuyMeACoffee to get started with the basics.
๐ Introduction to JavaScript: Your First Steps in Coding
By following these best practices, you can optimize the performance of your Angular applications, providing a better experience for your users. Happy coding! ๐
Series Index
Part | Title | Link |
---|---|---|
1 | 8 Exciting New JavaScript Concepts You Need to Know | Read |
2 | Top 7 Tips for Managing State in JavaScript Applications | Read |
3 | ๐ Essential Node.js Security Best Practices | Read |
4 | 10 Best Practices for Optimizing Angular Performance | Read |
5 | Top 10 React Performance Optimization Techniques | Read |
6 | Top 15 JavaScript Projects to Boost Your Portfolio | Read |
7 | 6 Repositories To Master Node.js | Read |
8 | Best 6 Repositories To Master Next.js | Read |
9 | Top 5 JavaScript Libraries for Building Interactive UI | Read |
10 | Top 3 JavaScript Concepts Every Developer Should Know | Read |
11 | 20 Ways to Improve Node.js Performance at Scale | Read |
12 | Boost Your Node.js App Performance with Compression Middleware | Read |
13 | Understanding Dijkstra's Algorithm: A Step-by-Step Guide | Read |
14 | Understanding NPM and NVM: Essential Tools for Node.js Development | Read |
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