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 🧠
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 📊
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 📚
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();
}
}
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.
👉 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! 🚀
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 | 🔒 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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