TypeScript
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http://www.typescriptlang.org/
TypeScript offers classes, interfaces, mixins, modules, and generics to help you build robust components.
These features are available at development time for high-confidence application development, but are compiled into simple JavaScript.
TypeScript types let you define interfaces between software components and to gain insight into the behavior of existing JavaScript libraries.
Handbook: http://www.typescriptlang.org/Handbook
Install
sudo npm install -g typescript
First program
cat > inheritance.ts
class Animal { constructor(public name: string) { } move(meters: number) { alert(this.name + " moved " + meters + "m."); } } class Snake extends Animal { constructor(name: string) { super(name); } move() { alert("Slithering..."); super.move(5); } } class Horse extends Animal { constructor(name: string) { super(name); } move() { alert("Galloping..."); super.move(45); } } var sam = new Snake("Sammy the Python"); var tom: Animal = new Horse("Tommy the Palomino"); sam.move(); tom.move(34);
tsc inheritance.ts