Summary of "Full React Tutorial #3 - Components & Templates"

Main Ideas and Concepts

components as Building Blocks:
components are fundamental to React applications, serving as self-contained sections of content (e.g., navbar, articles, sidebars). Each component encapsulates its own template (HTML-like structure) and logic (JavaScript functions).
Root Component:
The application starts with a single root component (e.g., App), which is rendered to the DOM. The root component is defined in index.js and is responsible for rendering all other components.
JSX Syntax:
JSX (JavaScript XML) is a syntax extension for JavaScript that looks similar to HTML but has differences. Example difference: In JSX, class is replaced with className to avoid conflicts with JavaScript reserved keywords.
Transpilation:
Babel is used to transpile JSX into standard HTML that the browser can understand.
React Version Considerations:
In React versions prior to 17, it was necessary to import React at the top of the file for components to function correctly. This is no longer required in version 17 and later.
Creating components:
components are defined as functions that return JSX templates. components must be exported at the bottom of the file to be used in other files.

Methodology / Instructions

Creating a Basic Component:
1. Define a function (e.g., App) that returns a JSX template.
2. Use a capitalized name for the component function.
3. Use className instead of class for styling in JSX.
4. Export the component at the end of the file.
5. Import the component in index.js and render it to the DOM.

Example Code Structure:


        // Example of a basic component
        function App() {
            return (
                <div className="App">
                    <div className="content">
                        <h1>App components</h1>
                    </div>
                </div>
            );
        }

        export default App;