React Hooks Introducing React Hooks 3

Question 1

According to the Rules of Hooks, where can you call Hooks?

Accepted Answer

Only at the top level of a function component or custom Hook

Answer

Anywhere in your code

Answer

Only inside loops

Answer

Only inside event handlers

Question 2

Why must Hooks not be called inside conditionals or loops?

Accepted Answer

React relies on call order to preserve state between renders

Answer

It causes a syntax error

Answer

It slows down rendering

Answer

It breaks JSX parsing

Question 3

From where are you allowed to call Hooks?

Accepted Answer

React function components and custom Hooks

Answer

Regular JavaScript functions

Answer

Class methods

Answer

Global module scope

Question 4

What tool helps enforce the Rules of Hooks automatically?

Accepted Answer

eslint-plugin-react-hooks

Answer

prettier

Answer

webpack

Answer

react-router

Question 5

What is a custom Hook?

Accepted Answer

A JavaScript function whose name starts with 'use' and that may call other Hooks

Answer

A built-in React API

Answer

A class that extends Component

Answer

A CSS-in-JS helper

Question 6

Do two components using the same custom Hook share state?

Accepted Answer

No, each call gets its own isolated state

Answer

Yes, they share one state instance

Answer

Only if they are siblings

Answer

Only with a context provider

Question 7

Which is NOT a valid place to call a Hook?

Accepted Answer

Inside a regular nested helper function

Answer

Top level of a function component

Answer

Inside a custom Hook

Answer

At the start of a custom Hook body