ReactJS Essentials Quiz

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Test your React knowledge.

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Alaa Adel

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Froggy Jumps ReactJS Essentials QuizOnline version Test your React knowledge. by Alaa Adel 1 What is a React component? a A reusable piece of UI b A CSS file c A database schema 2 What is JSX in React? a A JavaScript syntax extension that looks like HTML b A templating language c A CSS preprocessor 3 Which hook adds state to a functional component? a useState b useContext c useEffect 4 What does useEffect do in React? a Manages routes b Runs side effects after render c Compiles JSX 5 What is the Virtual DOM? a A lightweight copy of the real DOM used for efficient updates b The actual browser DOM only c A CSS stylesheet 6 How do you pass data from parent to child in React? a Via localStorage b Via props c Via state 7 What is a 'key' in React list rendering for? a A function b Unique identifier to help React track items c A CSS class 8 What does 'lifting state up' mean? a Moving state to a common ancestor to share data b Copying state to all components c Storing state only in localStorage 9 What is the purpose of the useEffect dependency array? a Defines component name b To control when the effect runs c Sets initial state only 10 What is a controlled component? a A component that never updates b An uncontrolled DOM element c A form element whose value is controlled by React state 11 Which hook provides a mutable value that persists across renders without causing re-renders? a useRef b useMemo c useState

Froggy Jumps

ReactJS Essentials QuizOnline version

Test your React knowledge.

by Alaa Adel

What is a React component?

A reusable piece of UI

A CSS file

A database schema

What is JSX in React?

A JavaScript syntax extension that looks like HTML

A templating language

A CSS preprocessor

Which hook adds state to a functional component?

useState

useContext

useEffect

What does useEffect do in React?

Manages routes

Runs side effects after render

Compiles JSX

What is the Virtual DOM?

A lightweight copy of the real DOM used for efficient updates

The actual browser DOM only

A CSS stylesheet

How do you pass data from parent to child in React?

Via localStorage

Via props

Via state

What is a 'key' in React list rendering for?

A function

Unique identifier to help React track items

A CSS class

What does 'lifting state up' mean?

Moving state to a common ancestor to share data

Copying state to all components

Storing state only in localStorage

What is the purpose of the useEffect dependency array?

Defines component name

To control when the effect runs

Sets initial state only

What is a controlled component?

A component that never updates

An uncontrolled DOM element

A form element whose value is controlled by React state

Which hook provides a mutable value that persists across renders without causing re-renders?

useRef

useMemo

useState

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ReactJS Essentials Quiz

Froggy Jumps

About this activity

Created by

Download the paper version to play

Top Games

Froggy Jumps

pizza

Froggy Jumps

Phlebotomy Order of Draw Quiz

Froggy Jumps

The Integumentary System

Froggy Jumps

Bill of Rights Game - The Constitutionalist

Froggy Jumps

Ethos, Pathos, and Logos Quiz

Froggy Jumps

ReactJS Essentials QuizOnline version

by Alaa Adel

What is a React component?

What is JSX in React?

Which hook adds state to a functional component?

What does useEffect do in React?

What is the Virtual DOM?

How do you pass data from parent to child in React?

What is a 'key' in React list rendering for?

What does 'lifting state up' mean?

What is the purpose of the useEffect dependency array?

What is a controlled component?

Which hook provides a mutable value that persists across renders without causing re-renders?

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