Hook naming conventions in React - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a custom React hook that tracks window width.

React

function [1]() {
  const [width, setWidth] = React.useState(window.innerWidth);
  React.useEffect(() => {
    const handleResize = () => setWidth(window.innerWidth);
    window.addEventListener('resize', handleResize);
    return () => window.removeEventListener('resize', handleResize);
  }, []);
  return width;
}

Drag options to blanks, or click blank then click option'

AgetWindowWidth

BWindowWidthHook

CuseWindowWidth

DwindowWidth

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the hook without the 'use' prefix

Using camelCase but missing 'use' at the start

Custom React hooks must start with use to follow naming conventions and enable React to identify them as hooks.

2fill in blank

medium

Complete the code to correctly name a hook that fetches user data.

React

function [1]() {
  const [user, setUser] = React.useState(null);
  React.useEffect(() => {
    fetch('/api/user')
      .then(res => res.json())
      .then(data => setUser(data));
  }, []);
  return user;
}

Drag options to blanks, or click blank then click option'

AfetchUserData

BuseUserData

CgetUser

DUserDataHook

Attempts:

3 left

💡 Hint

Common Mistakes

Using verbs like 'fetch' or 'get' without 'use' prefix

Naming the hook like a regular function

Hooks must start with use. useUserData follows this rule and clearly describes the hook's purpose.

3fill in blank

hard

Fix the error in the hook name to follow React hook naming conventions.

React

function [1]() {
  const [count, setCount] = React.useState(0);
  return [count, setCount];
}

Drag options to blanks, or click blank then click option'

AuseCount

BCountHook

CcountState

DgetCount

Attempts:

3 left

💡 Hint

Common Mistakes

Naming hooks like regular functions without 'use' prefix

Using camelCase but missing 'use' at the start

The hook name must start with use. useCount is the correct form.

4fill in blank

hard

Fill both blanks to correctly name a hook and its internal state variable.

React

function [1]() {
  const [[2], setValue] = React.useState('');
  return [[2], setValue];
}

Drag options to blanks, or click blank then click option'

AuseInput

BinputValue

Cvalue

DInputHook

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the hook without 'use' prefix

Using generic or unclear state variable names

The hook name must start with use, so useInput is correct. The state variable should be descriptive, like inputValue.

5fill in blank

hard

Fill all three blanks to create a hook that manages a boolean toggle state with proper naming.

React

function [1]() {
  const [[2], [3]] = React.useState(false);
  const toggle = () => [3](![2]);
  return [[2], toggle];
}

Drag options to blanks, or click blank then click option'

AuseToggle

BisOn

CsetIsOn

DtoggleState

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent names for state and setter

Not starting hook name with 'use'

The hook name useToggle follows conventions. The state variable isOn clearly shows a boolean. The setter setIsOn matches the state variable name.