TypeScript

TypeScript is a typed version of JavaScript. It claims to be a superset of JavaScript.

Syntax

Here we focus on the syntax differences between TypeScript and JavaScript.

Classes

In TypeScript, you should declare properties above the constructor like so:

class Greeter {
  greeting: string;

  constructor(message: string) {
    this.greeting = message;
  }

  greet() {
    return "Hello, " + this.greeting;
  }
}

Interfaces

Unlike JavaScript, TypeScript comes with support for interfaces:

interface LabeledValue {
  label: string;
}

Compilation

Install TypeScript
```
npm install -g typescript
```
Compile your typescript file
```
tsc greeter.js
```

Resources

The TypeScript Handbook