FAQ: Components Render Other Components - Review

Frequently Asked Questions Uncategorized
1

Community%20FAQs%20on%20Codecademy%20Exercises
Community%20FAQs%20on%20Codecademy%20Exercises1000×208 141 KB

This community-built FAQ covers the “Review” exercise from the lesson “Components Render Other Components”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Create a Front-End App with React
Full-Stack Engineer
Front-End Engineer
Create an Advanced Web App with React and Redux
Front-End Development
Front-End Development

Learn React
Learn React: Introduction

FAQs on the exercise Review

There are currently no frequently asked questions associated with this exercise – that’s where you come in! You can contribute to this section by offering your own questions, answers, or clarifications on this exercise. Ask or answer a question by clicking reply (reply) below.

If you’ve had an “aha” moment about the concepts, formatting, syntax, or anything else with this exercise, consider sharing those insights! Teaching others and answering their questions is one of the best ways to learn and stay sharp.

Join the Discussion. Help a fellow learner on their journey.

Ask or answer a question about this exercise by clicking reply (reply) below!
You can also find further discussion and get answers to your questions over in #get-help.

Agree with a comment or answer? Like (like) to up-vote the contribution!

Need broader help or resources? Head to #get-help and #community:tips-and-resources. If you are wanting feedback or inspiration for a project, check out #project.

Looking for motivation to keep learning? Join our wider discussions in #community

Learn more about how to use this guide.

Found a bug? Report it online, or post in #community:Codecademy-Bug-Reporting

Have a question about your account or billing? Reach out to our customer support team!

None of the above? Find out where to ask other questions here!

2

Any working solution for this exercise?

3

HelloWorld.js
import React from “react”;

function HelloWorld() {
return (


Hello World!



);
}

export default HelloWorld;

App.js
import React from ‘react’;
import HelloWorld from ‘./HelloWorld’;

function App() {
return (

);
}

export default App;

index.js
import React from “react”;

import ReactDOM from “react-dom/client”;

import App from “./App”;

const root = ReactDOM.createRoot(document.getElementById(“app”));

root.render();

1 Like
4

Solution

In the HelloWorld.js file:

import React from "react";

function HelloWorld() {
  return <h1>Hello World!</h1>;
}

export default HelloWorld;

In the App.js file:

import React from "react";
import HelloWorld from "./HelloWorld";

function App() {
  return <HelloWorld />;
}

export default App;

In the index.js file:

import React from "react";
import ReactDOM from "react-dom/client";
import App from "./App";

const root = ReactDOM.createRoot(document.getElementById("app"));

root.render(<App />);
5

Something that’s been bugging me a lot as this tutorial rolls on, but came to a head with this exercise:

Where does the id of “app” come from? In the solution to this exercise, it is never defined, but yet is referenced and works. In other exercises, “app” is formally defined as an ID for a tag in html code somewhere. How do I know which to do? Where is the “app” tag located (and what does it refer to) when none of our written code defines the “app” id?

6

If you click the file icon in the text editor. You will find an HTML file. If you go to the body you will see the “app” id.

1 Like