Vue JS Foundation of Vue Js 3

Question 1

Which lifecycle hook runs after a component is first rendered to the DOM in Vue 3 Composition API?

Accepted Answer

onMounted

Answer

onMounted fires after the component has been inserted into the DOM.

Question 2

What does the computed() function return?

Accepted Answer

A reactive value that updates when its dependencies change

Answer

computed() returns a cached reactive reference that recalculates only when a dependency changes.

Question 3

How does a child component send data up to its parent in Vue?

Accepted Answer

By emitting a custom event

Answer

A child emits a custom event (via emit) that the parent listens to with v-on.

Question 4

What is the correct way to pass static text into a child component prop?

Accepted Answer

message="hello"

Answer

Without the colon, the attribute passes a literal static string to the prop.

Question 5

Which option declares the data a component accepts from its parent in the Options API?

Accepted Answer

props

Answer

The props option lists the inputs a component receives from its parent.

Vue JS Practice Test