v-show vs v-if difference in Vue - Quick Revision & Key Differences

Recall & Review

beginner

What does v-if do in Vue?

v-if conditionally renders elements. If the condition is false, the element is not in the DOM at all.

beginner

How does v-show differ from v-if in Vue?

v-show always keeps the element in the DOM but toggles its CSS display property to show or hide it.

intermediate

Which directive is better for toggling visibility frequently: v-show or v-if?

v-show is better for frequent toggling because it only changes CSS display without adding/removing elements from the DOM.

intermediate

What is a downside of using v-if for toggling elements?

Using v-if repeatedly can be slower because Vue adds or removes elements from the DOM each time the condition changes.

intermediate

If you want to conditionally render a large component only once, which directive should you use?

Use v-if to avoid rendering the component when not needed, saving resources.

What happens to an element with v-if="false" in Vue?

A It stays visible

B It is hidden with CSS display:none

C It is removed from the DOM

D It throws an error

v-if removes the element from the DOM when the condition is false.

Which directive keeps the element in the DOM but hides it visually?

A v-show

B v-bind

C v-if

D v-for

v-show toggles the CSS display property to hide or show the element without removing it from the DOM.

For a component that toggles visibility many times, which is more efficient?

A v-show

B v-if

C v-bind

D v-on

v-show is more efficient for frequent toggling because it only changes CSS display.

Which directive should you use to avoid rendering a component until needed?

A v-pre

B v-show

C v-model

D v-if

v-if delays rendering until the condition is true, saving resources.

What is a disadvantage of using v-show?

A It removes elements from the DOM

B The element is always in the DOM, using memory

C It does not work with components

D It can cause flickering

v-show keeps the element in the DOM even when hidden, which can use memory unnecessarily.

Explain the difference between v-show and v-if in Vue and when to use each.

Think about DOM presence and performance.

Describe a scenario where using v-if is better than v-show.

Consider resource usage and rendering cost.