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[ilonavarro]

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[github-learning-lab]

Building Blocks of Life Apps - Components

Awesome! You successfully opened a pull request!

In this Pull Request you will:

• Add components
• Pass data to child components
• Create and use state variables
• Use callback functions to communicate data

First, we'll learn about components.

Components

Components are the building blocks of React apps. Think of components as different parts of the app. Each button is a component, each paragraph of text is a component, and so on. From html, you might recognize some of the built in components like <div /> and <li />. In React, we can create our own components! How cool is that?

Components in src/App.jsx

In our solution, our assignments page looks like the above. The overall webpage is a component called App. Inside App there are other components like buttons, titles, and custom components that we can create (like the Assginments List).

Take a look at the following line in src/App.jsx.

class App extends React.Component

This line takes a component's properties to create a component named "App". In the render method of App, there are other components like <button/>. These components are child components because they are all a part of its parent, App.

Scroll down to add a header component.

[github-learning-lab]

Step 2: Adding components

Let's add a child component and give our app a header. At the end of the step, your app should like the following:

⌨️ Activity: Add an h3 component to src/App.jsx

1. In src/App.jsx, replace line 92 with this header component:

   <h3 className="Box-title d-flex flex-justify-center">GradeBook</h3>

2. Save your file
3. To run the code, move inside the repository directory in your terminal and run npm start
4. Exit the process in your terminal using Ctrl + C
5. Stage, commit, and push your code to the changes branch:

   git add src/App.jsx
   git commit -m "add a header component"
   git push
   

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