---
title: "Hello, World! Building Your First TypeScript App"
date: "2025-01-15"
excerpt: "A beginner-friendly introduction to TypeScript with practical examples and best practices."
---

Welcome to the blog! In this post, we'll explore TypeScript from the ground up.

## Why TypeScript?

TypeScript adds static typing to JavaScript, catching errors at compile time rather than at runtime. Here's a simple example:

```ts
function greet(name: string): string {
  return `Hello, ${name}!`
}

console.log(greet("World"))
```

## Type Safety in Practice

Let's look at a more complex example with interfaces:

```ts
interface User {
  id: number
  name: string
  email: string
  role: "admin" | "user"
}

function createUser(data: Partial<User>): User {
  return {
    id: Math.random(),
    name: data.name ?? "Anonymous",
    email: data.email ?? "",
    role: data.role ?? "user",
  }
}

const user = createUser({ name: "Alice", email: "alice@example.com" })
```

## Key Concepts

- **Interfaces**: Define object shapes
- **Generics**: Create reusable components
- **Union types**: Handle multiple possible values
- **Type guards**: Narrow types at runtime

> "TypeScript is JavaScript with syntax for types." — TypeScript Handbook

## Next Steps

Check out our other posts for deep dives into:
- Mathematics with KaTeX
- Hybrid content with code and equations
