Component Best Practices
Introduction
Section titled “Introduction”Following best practices ensures your Angular components are maintainable, performant, and scalable. These guidelines are battle-tested in enterprise applications.
Best Practices
Section titled “Best Practices”1. Single Responsibility
Section titled “1. Single Responsibility”Each component should do one thing and do it well. If a component grows too large, break it into smaller components.
2. OnPush Change Detection
Section titled “2. OnPush Change Detection”@Component({ changeDetection: ChangeDetectionStrategy.OnPush})3. Smart vs Dumb Components
Section titled “3. Smart vs Dumb Components”- Smart components: connect to services/store, orchestrate data
- Dumb components: @Input/@Output only, pure UI
4. Use trackBy with *ngFor
Section titled “4. Use trackBy with *ngFor”trackByFn(index: number, item: any) { return item.id;}5. Unsubscribe in ngOnDestroy
Section titled “5. Unsubscribe in ngOnDestroy”ngOnDestroy() { this.subscription?.unsubscribe();}6. Keep Templates Simple
Section titled “6. Keep Templates Simple”Move complex logic to the component class or extract into pipes/services.
7. Use Immutable Data
Section titled “7. Use Immutable Data”Always return new object references for @Input properties.
Summary
Section titled “Summary”Following these best practices keeps your Angular codebase clean, performant, and maintainable as it grows.”