Question

What is the primary purpose of the ngDoCheck method in Angular?

a) Detect and act upon changes Angular can't detect
b) Initialize the component's views
c) Handle content projection
d) Perform unit testing

Answer 1

The primary purpose of the ngDoCheck method in Angular is to detect and act upon changes that Angular is unable to detect automatically.

Step-by-step explanation:

The primary purpose of the ngDoCheck method in Angular is to detect and act upon changes that Angular is unable to detect automatically.

This method is called after every change detection cycle and provides an opportunity to perform manual change detection or handle specific scenarios where Angular's default change detection mechanism may not be sufficient.

For example, if a property of a component is updated but it is not detected by Angular, you can implement the ngDoCheck method to manually check if the property has changed and perform any necessary actions accordingly.