Angular
Handling Memory Leaks in Angular Applications
Introduction
Memory leaks in Angular apps can slow performance over time. Here’s how to prevent them efficiently.
Common Causes
- Unsubscribed Observables: Subscriptions not cleaned up.
- Detached DOM Elements: Components holding onto references after removal.
- Excessive Event Listeners: Unremoved event listeners leading to memory buildup.
Best Practices
1. Use async Pipe
Avoid manual subscriptions by using Angular’s async pipe in templates.
<div *ngIf="data$ | async as data">{{ data }}</div>
2. Unsubscribe from Observables
For manual subscriptions, use takeUntil with a Subject to ensure cleanup.
private destroy$ = new Subject<void>();this.service.getData().pipe(takeUntil(this.destroy$)).subscribe(data => { this.data = data;});ngOnDestroy() { this.destroy$.next(); this.destroy$.complete();}
3. Remove Event Listeners
Always clean up event listeners in ngOnDestroy().
document.addEventListener('click', this.onClick);ngOnDestroy() { document.removeEventListener('click', this.onClick);}
4. Avoid Memory Leaks with Services
Use providedIn: 'root' for services only if needed globally. Otherwise, provide them in feature modules.
5. Track Performance with DevTools
Use Chrome DevTools or Angular Profiler to detect leaks early.
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