Introduction

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Welcome to React Learn

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What You’ll Learn

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TypeScript Fundamentals

• Variables and Constants: Understanding let, const, and type annotations
• Template Strings: Modern string interpolation techniques
• Object Literals: Working with typed objects and interfaces
• Arrays and Functions: Functional programming with TypeScript
• Destructuring: Object and array destructuring patterns
• Import/Export: Module system and code organization
• Async Operations: Promises, async/await, and the Fetch API

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React Basics

• Component Creation: Functional components with TypeScript
• JSX Syntax: Writing declarative UI with type safety
• Props and Interfaces: Typed component props
• State Management: Using the useState hook
• Event Handling: Interactive user interfaces
• Conditional Rendering: Dynamic UI based on state
• List Rendering: Mapping arrays to components
• CSS Modules: Scoped styling with TypeScript support

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Key Features

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Real-World Examples

// TypeScript function with interfaces
interface User {
  uid: string;
  username: string;
}

function getUser(): User {
  return {
    uid: '112d',
    username: 'angelosgd',
  }
}

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Interactive Components

export const ItemCounter = ({ name, quantity }: Props) => {
  const [count, setCount] = useState(Number)

  const handleAdd = () => {
    setCount(count + 1)
  }

  return (
    <section>
      <span>{name}</span>
      <button onClick={handleAdd}>+1</button>
      <span>{count}</span>
    </section>
  )
}

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Modern Tooling

• Vite: Lightning-fast build tool with HMR
• TypeScript: Full type safety and IntelliSense
• ESLint: Code quality and consistency
• Vitest: Testing with React Testing Library
• CSS Modules: Scoped styling

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Learning Outcomes

• Write type-safe JavaScript with TypeScript
• Understand modern JavaScript features (ES6+)
• Create functional React components with hooks
• Manage component state and handle user interactions
• Structure React applications with proper TypeScript typing
• Use modern development tools and workflows
• Apply best practices for component composition

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Ready to Start?