What is @ContentChildren decorator in Angular?

The @ContentChildren decorator in Angular is used to query for elements or directives that are used within content projection in a component’s template. Content projection allows a component to project its content into a designated area within its template, and the @ContentChildren decorator can be used to query for the projected content.

When used in conjunction with the ContentChild decorator, the @ContentChildren decorator can be used to query for multiple instances of a directive or component within the projected content. This can be particularly useful when working with dynamic or configurable content within a component.

To use the @ContentChildren decorator, it is first necessary to import it from the ‘@angular/core’ package. Once imported, it can be used within a component or directive class to query for content projected into the component’s template. The @ContentChildren decorator takes a selector as an argument, allowing the developer to specify the type of content to query for.

In an interview setting, it may be valuable to discuss the use cases for the @ContentChildren decorator, as well as its advantages and potential pitfalls. It can demonstrate an understanding of Angular’s capabilities and how they can be leveraged to build more dynamic and flexible components.