Question

When does the ngOnChanges method run in an Angular component's lifecycle?

a) Before the constructor
b) After ngDoCheck
c) After ngOnInit
d) After the component is created

Answer 1

The ngOnChanges method runs after an Angular component is created, before ngOnInit, and is used to detect changes to input properties.

Step-by-step explanation:

The ngOnChanges method in an Angular component's lifecycle runs after the component is created but before other lifecycle hooks like ngOnInit. It's specifically designed to be executed whenever the input properties of a component change. This method is called before ngOnInit and after the constructor of the component. ngOnChanges is typically used to implement custom change-detection logic or perform actions based on the updated inputs from the parent component.