Properly unsubscribing from observables is crucial for preventing memory leaks and ensuring optimal performance in Angular applications. As the creator of CoreUI, a widely used open-source UI library, I’ve implemented subscription cleanup patterns in countless Angular enterprise applications and admin dashboards. From my 25 years of experience in web development and 11 years with Angular, the most effective approach is to use the takeUntil operator with a destroy subject pattern. This method provides automatic cleanup and prevents common memory leak issues.

The ngOnDestroy lifecycle hook in Angular is essential for cleaning up resources when components are destroyed to prevent memory leaks and ensure optimal application performance. As the creator of CoreUI with over 11 years of Angular development experience, I implement ngOnDestroy in every component that has subscriptions, timers, or event listeners. This hook is called just before Angular destroys the component, making it the perfect place for cleanup operations.