Typescript game of life

gistfile1.ts

// start of a port of Ristretto/Coffeescript game of life to typescript
// http://withouttheloop.com/articles/2013-08-11-coffeescript-gameoflife-ristretto/

class Cell {	
	constructor(public x: number, public y:number) {}
}

function isNeighbour(c:Cell, x:number, y:number): boolean {
	return Math.abs(x-c.x) < 2 
		&& Math.abs(y-c.y) < 2 
		&& (!(x === c.x && y === c.y))
}

function livingNeighbours(cs:Cell[], x:number, y:number): number {
	return cs.filter(function (c) {
		return isNeighbour(c, x, y);
	}).length;
}

function