Angular Interview Practice

The ngOnInit lifecycle hook is specifically designed for performing initialization logic after a component has been created. This hook is invoked shortly after the component is instantiated and is a suitable place for any setup you need to do, such as fetching data from a service, initializing properties, or subscribing to observables.

Using ngOnInit ensures that your component’s dependencies are fully set up and ready to use. This is particularly useful since constructors are often used for dependency injection and setting up initial values, but they should not contain complex logic. Therefore, ngOnInit is the appropriate place to implement such logic, making sure that the component's view and its data are properly initialized and ready before rendering to the user.

Additionally, while the other options do represent important functionalities within Angular, they either relate to areas outside of direct component initialization (like setting up routing) or to maintaining the component's state or lifecycle in other contexts (like handling data binding updates or safely destroying the component).