SlivTime

var Human = function (coords) {
	this.top = coords.top || 0;
	this.left = coords.left || 0;
};

Human.prototype = {
	go: function (coords) {
		this.top += coords.top || 0;
		this.left += coords.left || 0;
		return this;
	},
	goUp: function () {
		return this.go({top: -1});
	},
	goDown: function () {
		return this.go({top: 1});
	},
	goLeft: function () {
		return this.go({left: -1});
	},
	goRight: function () {
		return this.go({left: 1});
	}
};

var vagabond = new Human({
	top: 2,
	left: 2
});

vagabond.goUp().goLeft().goDown().goDown().goRight();
vagabond.go({
	top: 0,
	left: 0
});