REACT MASTER CLASS /// COMPONENTS & PROPS /// JSX ARCHITECTURE /// BUILD UIs /// REACT MASTER CLASS /// COMPONENTS & PROPS /// JSX ARCHITECTURE /// BUILD UIs /// REACT MASTER CLASS /// COMPONENTS & PROPS /// JSX ARCHITECTURE /// BUILD UIs ///

React Components

Learn the building blocks of modern web applications. Construct your UI with functional components, pass data via props, and orchestrate it all with JSX.

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Tutor:Welcome to React! In React, everything is a Component. Think of them as custom, reusable UI building blocks. A functional component is simply a JavaScript function that returns JSX (HTML-like syntax inside JS).


Skill Matrix

UNLOCK NODES BY MASTERING COMPONENT CONCEPTS.

The Component

Components define elements. They are JavaScript functions that return UI. They must start with a Capital Letter.

System Check

What MUST a React component return?

Component Hub

Showcase Your UI

ACTIVE

Built an awesome React component? Share your code snippets and composition examples with the crew.

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React Components & Props

Author

Pascual Vila

Frontend Instructor // Code Syllabus

React lets you define your UI as independent, reusable pieces called Components. You can think of components as custom HTML tags that you write using JavaScript.

Functional Components

The most common way to define a component is to write a JavaScript function. A valid functional component must follow two rules: It must start with a Capital Letter (PascalCase), and it must return JSX (or null).

Dynamic Data with Props

Props (short for properties) allow you to pass data from a parent component down to a child component. They are read-only and behave like arguments passed to a regular function. Instead of hardcoding text, you use {props.propertyName} to render values dynamically.

Composition & Fragments

You can build complex UIs by nesting components inside other components, which is called Composition. If your component needs to return multiple elements without adding an extra wrapper div to the DOM, you should use a React Fragment: <>...</>.

View Full Transcript+

This section contains the full detailed transcript covering React component architecture, the shift from class-based components to functional components, how to properly destructure props (e.g., function Avatar({ user, size })), and the strict rules of JSX, including closing all tags and returning a single parent element.

React Glossary

Component

An independent, reusable piece of UI. In modern React, they are primarily written as JavaScript functions.

snippet.jsx

Props

Arguments passed into React components. They are read-only and passed down from parent to child.

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JSX

A syntax extension for JavaScript that looks similar to XML or HTML. It translates to React.createElement() calls.

snippet.jsx

Fragment

A pattern to group a list of children without adding extra nodes to the DOM (represented by empty tags).

snippet.jsx

Composition

Combining smaller, simpler components to create more complex and nested UI structures.

snippet.jsx

Destructuring Props

A JavaScript feature often used in React to unpack specific properties from the props object directly in the parameter list.

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