TypeScript is a strongly typed programming language that builds on JavaScript, giving you better tooling at any scale.
## Why TypeScript?
TypeScript adds optional static typing to JavaScript. This helps catch errors early in development and provides better IDE support:
```typescript
interface User {
id: string;
name: string;
email: string;
}
function greetUser(user: User): string {
return `Hello, ${user.name}!`;
}
```
## Key Benefits
1. **Type Safety**: Catch errors at compile time
2. **Better IDE Support**: Autocomplete and IntelliSense
3. **Improved Refactoring**: Safe code transformations
4. **Documentation**: Types serve as inline documentation
## Advanced Types
TypeScript supports advanced type patterns:
```typescript
type Result
| { success: true; data: T }
| { success: false; error: E };
async function fetchUser(id: string): Promise
try {
const response = await fetch(`/api/users/${id}`);
const data = await response.json();
return { success: true, data };
} catch (error) {
return { success: false, error: error as Error };
}
}
```
## Conclusion
TypeScript is a powerful tool that enhances JavaScript development with type safety and better tooling.