Скачать или смотреть What is onChange and onInit?

Lifecycle hooks are a set of methods in Angular that are executed at specific moments during the lifecycle of a component.
These methods provide a way to tap into the Angular component lifecycle and perform custom logic or operations at specific points in time.

ngOnChanges: This lifecycle hook is executed whenever the component's input properties change.
ngOnInit: This lifecycle hook is executed after the component's constructor method and is a good place to perform the initial setup for the component.

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