> For the complete documentation index, see [llms.txt](https://university-west.gitbook.io/programming-paradigms/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://university-west.gitbook.io/programming-paradigms/web-development/scripting-languages/typescript.md).

# TypeScript

#### What is TypeScript?

TypeScript is a superset of JavaScript developed by Microsoft that adds static types to the language. It is designed for the development of large applications and transcompiles to JavaScript.

#### TypeScript vs. JavaScript

* **Static Typing**: TypeScript introduces static typing, allowing developers to define types for variables, function parameters, and return values. JavaScript is dynamically typed.
* **Class Features**: TypeScript supports modern JavaScript features as well as additional features such as enums and interfaces, providing more tools to catch errors at compile time.
* **Tool Support**: TypeScript offers enhanced autocompletion, navigation, and refactoring services in editors, thanks to its type information.
* **Compatibility**: TypeScript code is compiled down to JavaScript, making it compatible with any JavaScript environment.
* **Learning Curve**: JavaScript developers may face a learning curve with TypeScript's typing system and additional features, but the core language remains familiar.

#### Current Uses of TypeScript

* **Web Development**: Widely used in front-end and back-end development for structuring large and complex web applications.
* **Frameworks and Libraries**: Many popular frameworks and libraries like Angular, React (with TypeScript definitions), and Vue.js support or encourage using TypeScript for development.
* **Enterprise-Level Applications**: Its static typing and object-oriented features make TypeScript an ideal choice for enterprise-level applications that require maintainability and scalability.

```typescript
// Example of integrating TypeScript with a webpage

// Define an interface for a user
interface User {
  name: string;
  age: number;
}

// A function that takes a User object and returns a greeting message
function greetUser(user: User): string {
  return `Hello, ${user.name}! You are ${user.age} years old.`;
}

// Creating a User object
const user: User = {
  name: "John Doe",
  age: 30
};

// Using the function and displaying the greeting in the webpage
document.body.innerHTML = greetUser(user);
```


---

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