Prop types and validation in Vue - Cheat Sheet & Quick Revision

Recall & Review

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What are props in Vue?

Props are custom attributes you can pass from a parent component to a child component to share data.

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How do you define prop types in Vue 3 with the Composition API?

You define props as an object with keys as prop names and values as their types or validation rules inside the <script setup> block.

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What is the purpose of prop validation in Vue?

Prop validation helps catch errors by checking if the passed prop matches the expected type or rules, making your app more reliable.

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How do you specify a required prop in Vue?

You add required: true in the prop definition to make sure the parent must provide that prop.

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What happens if a prop fails validation in Vue during development?

Vue shows a warning in the browser console to help you fix the issue before it causes bugs.

In Vue, how do you define a prop that must be a string and is required?

A { type: String, required: true }

B { type: Number, required: true }

C { type: String, default: '' }

D { required: true }

The correct way is to specify the type as String and set required to true.

What is the default behavior if you do not specify prop validation in Vue?

A Vue accepts any type without warnings

B Vue throws an error

C Vue converts the prop to a string

D Vue ignores the prop

Without validation, Vue accepts any type and does not warn.

Which Vue feature helps you check if a prop value meets custom rules?

A Directives

B Validator function inside prop definition

C Watchers

D Computed properties

You can add a validator function to check custom rules for a prop.

Where do you define props in a Vue 3

A Inside data()

B Inside computed

C Inside methods

D Inside the defineProps() function

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