Angular Web Framework Components & Templates 4

Question 1

What is a standalone component in Angular?

Accepted Answer

A component that declares its own dependencies without an NgModule

Answer

Standalone components use `standalone: true` and list their own imports, removing the requirement to be declared in an NgModule.

Question 2

In Angular's template, what does the safe navigation operator (`?.`) prevent?

Accepted Answer

Null or undefined property access that would throw an error

Answer

The ?. operator short-circuits the expression if the left-hand side is null or undefined, preventing template errors.

Question 3

What ViewEncapsulation mode causes Angular to emit styles globally without any scoping?

Accepted Answer

None

Answer

ViewEncapsulation.None adds component styles to the global stylesheet with no attribute-based scoping applied.

Question 4

Which hook would you use to clean up subscriptions or timers before a component is removed from the DOM?

Accepted Answer

ngOnDestroy

Answer

ngOnDestroy is called just before Angular destroys the component, making it the correct place to cancel subscriptions and clear intervals.

Question 5

What does `@ContentChildren(ItemComponent)` return inside a component?

Accepted Answer

A QueryList of all projected ItemComponent instances

Answer

@ContentChildren queries projected content and returns a live QueryList containing all matching component or directive instances.

Angular Web Framework Practice Test