Angular Interview Questions

Question 1

default modules

Question 2

Lifecycle hooks

Answer 2

predefined methods in angular that enable developers to access stages of a components life cycle.

beginds with instantiation and rendering of the view and ends with destruction and removal of a component directive from the DOM.

Angular performs change detection throughout lifecycle to update the view and component instance when need.

Question 3

ngOnChanges

Answer 3

when 1 > more input properties of a component change, this method is invoked.

receives object containing the input properties prior and present values.

Question 4

NgOnInit

Answer 4

method invoked after component initialization and when the input properties have been set. The ideal place to perform initialization logic that depends on input properties.

Question 5

ngAfterViewInit

Answer 5

method called once we verify component view has been initialized.

Question 6

ngAfterViewChecked

Answer 6

This method is called after the component’s view has been checked for changes.

Question 7

ngOnDestroy

Answer 7

This method is invoked before the component’s destruction. It enables you to perform any cleanup logic necessary

Question 8

ngDoCheck

Answer 8

We call this method during every change detection cycle of the component. It enables you to custom change detection logic.

Question 9

ngAfterContentInit

Answer 9

We invoke this method only after the component’s content has been projected into its view.