ReactDOM render process - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to render a React component into the root element.

React

ReactDOM.[1](<App />, document.getElementById('root'));

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

Arender

BcreateElement

Chydrate

DuseState

Attempts:

3 left

💡 Hint

Common Mistakes

Using createElement instead of render

Using useState which is a hook, not a render method

Using hydrate which is for server-side rendering

The render method of ReactDOM is used to display a React component inside a DOM element.

2fill in blank

medium

Complete the code to create a root for React 18+ rendering.

React

const root = ReactDOM.[1](document.getElementById('root'));

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

Arender

BcreateRoot

ChydrateRoot

DcreateElement

Attempts:

3 left

💡 Hint

Common Mistakes

Using render instead of createRoot in React 18+

Using hydrateRoot which is for hydration

Using createElement which creates React elements, not roots

In React 18+, createRoot is used to create a root for concurrent rendering.

3fill in blank

hard

Fix the error in the code to render the component using the root.

React

root.[1](<App />);

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

Ahydrate

BcreateRoot

Crender

DuseEffect

Attempts:

3 left

💡 Hint

Common Mistakes

Calling createRoot again on the root object

Using hydrate which is for hydration

Using useEffect which is a hook, not a root method

After creating a root with createRoot, you call render on it to display the component.

4fill in blank

hard

Fill both blanks to hydrate a server-rendered React app.

React

ReactDOM.[1]Root(document.getElementById('root')).[2](<App />);

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

Ahydrate

Brender

DcreateRoot

Attempts:

3 left

💡 Hint

Common Mistakes

Using renderRoot instead of hydrateRoot

Using hydrate directly without createRoot or hydrateRoot

Mixing up render and hydrate methods

To hydrate a server-rendered app in React 18+, you use hydrateRoot to create the root and then render to display the component.

5fill in blank

hard

Fill all three blanks to create a root and render a component with strict mode.

React

const root = ReactDOM.[1](document.getElementById('root'));
root.[2](
  <React.[3]>
    <App />
  </React.[3]>
);

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

AcreateRoot

Brender

CStrictMode

DhydrateRoot

Attempts:

3 left

💡 Hint

Common Mistakes

Using hydrateRoot instead of createRoot for client rendering

Not wrapping in StrictMode

Using render on ReactDOM instead of on the root

This code creates a root with createRoot, then renders the App component wrapped in StrictMode for extra checks.