TypeScript vs CoffeeScript

animal.coffee

class Animal
  constructor: (@name) ->

  move: (meters) ->
    alert @name + " moved #{meters}m."

class Snake extends Animal
  move: ->
    alert "Slithering..."
    super 5

class Horse extends Animal
  move: ->
    alert "Galloping..."
    super 45

sam = new Snake "Sammy the Python"
tom = new Horse "Tommy the Palomino"

sam.move()
tom.move()

animal.ts

class Animal {
	constructor (public name: string) {
		
	}
	move (meters: number) {
		return alert(this.name + " moved " + meters + " meters")
	}
}

class Snake extends Animal {
	move() {
		alert('slithering')
		return super.move(5)
	}
}

class Horse extends Animal {
	move() {
		alert('galloping')
		return super.move(45)
	}
}

var sam = new Snake("sammy the python");
var tom = new Horse("Tommy the Palomino");

sam.move();
tom.move();