This is a Next.js project bootstrapped with create-next-app.

Getting Started

First, run the development server:

npm run dev
# or
yarn dev
# or
pnpm dev
# or
bun dev

Open http://localhost:3000 with your browser to see the result.

You can start editing the page by modifying app/page.tsx. The page auto-updates as you edit the file.

This project uses next/font to automatically optimize and load Geist, a new font family for Vercel.

TypeScript vs JavaScript

This project demonstrates key differences between TypeScript and JavaScript, highlighting:

• Strong typing in TypeScript vs dynamic typing in JavaScript
• Interface and type definitions available in TypeScript
• Enhanced IDE support and error checking with TypeScript
• Compatibility between TypeScript and JavaScript
• Better refactoring capabilities with TypeScript

Practical TypeScript Advantages

Type Safety

TypeScript's static typing helps catch errors during development rather than at runtime. For example:

// TypeScript
function calculateTotal(price: number, quantity: number): number {
  return price * quantity;
}

// This would cause a compile-time error
calculateTotal("10", 5); // Error: Argument of type 'string' is not assignable to parameter of type 'number'

In JavaScript, this would only fail at runtime or produce unexpected results.

Developer Experience

TypeScript provides better autocompletion, inline documentation, and refactoring tools:

// With proper typing, editors can suggest all available methods
const user = {
  name: "John",
  email: "john@example.com",
  preferences: {
    theme: "dark",
    notifications: true
  }
};

// Editor can autocomplete all properties
user.preferences.theme; // Autocomplete works for deeply nested properties

Interfaces and Type Definitions

TypeScript allows defining clear contracts for your code:

interface User {
  id: number;
  name: string;
  email: string;
  role: "admin" | "user" | "guest"; // Union types for specific values
  lastLogin?: Date; // Optional properties
}

// Function that requires a User object
function updateUser(user: User): void {
  // Implementation
}

Gradual Adoption

You can migrate JavaScript to TypeScript incrementally:

1. Rename .js files to .ts
2. Configure tsconfig.json with "allowJs": true
3. Add types gradually as you refactor code
4. Use // @ts-ignore or any type for complex cases initially

Real-world Benefits

• Reduced Bugs: Studies show TypeScript can prevent ~15% of bugs that would occur in JavaScript
• Better Documentation: Types serve as living documentation
• Safer Refactoring: The compiler catches breaking changes
• Team Scalability: Easier onboarding and collaboration in large codebases

When to Use JavaScript Instead

• Small projects with limited complexity
• Prototyping and rapid development (though TypeScript can be configured for this too)
• When team familiarity with TypeScript is low
• Scripts with minimal dependencies and simple functionality

Learn More

To learn more about Next.js, take a look at the following resources:

• Next.js Documentation - learn about Next.js features and API.
• Learn Next.js - an interactive Next.js tutorial.

You can check out the Next.js GitHub repository - your feedback and contributions are welcome!

Deploy on Vercel

The easiest way to deploy your Next.js app is to use the Vercel Platform from the creators of Next.js.

Check out our Next.js deployment documentation for more details.