Lifecycle hooks in Angular

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Lifecycle hooks in Angular

Lifecycle hooks in Angular

Angular, a robust framework for building dynamic web applications, offers developers a range of lifecycle hooks that provide valuable insights into the lifecycle hooks of Angular components. These hooks enable developers to execute custom logic at specific stages of a component’s lifecycle, enhancing control and flexibility. Let’s explore how you can utilize Angular lifecycle hooks in your projects and delve into their essence.


1. ngOnChanges(): The ngOnChanges() method is called when one or more input properties of a component change. It provides a hook for responding to changes in input properties and performing additional logic based on the changes.


2. ngOnInit(): The ngOnInit() method is invoked after Angular has initialized all data-bound properties of a component. Developers commonly use it to initialize component properties and fetch initial data from external sources.


3. ngDoCheck: During every change detection cycle, Angular calls the ngDoCheck hook, enabling developers to perform custom change detection logic.


4. ngAfterContentInit: Angular calls the ngAfterContentInit hook after projecting external content into the component’s view. Developers commonly use it for initialization that depends on content projection.


5. ngAfterViewInit: Angular calls the ngAfterViewInit hook after initializing the component’s views and child views.


6. ngOnDestroy: Angular calls the ngOnDestroy hook just before destroying the component. Developers commonly use it for cleanup tasks, such as unsubscribing from observables or releasing resources.



By understanding and leveraging these lifecycle hooks, developers can enhance the functionality and performance of their Angular components. Each hook provides a specific opportunity to perform tasks at different stages of the component lifecycle, ensuring better control and optimization of Angular applications.