gistfile1.js

var Circle = function(r) {
	this.setRadius(r);
};

Circle.prototype = {
	getRadius: function(){
		return this.radius;
	},

	setRadius: function(r){
		this.radius = r;
	}
};


var c = new Circle(5);
console.log(c.getRadius());

var c2 = new Circle(7);
c2.setRadius(c.getRadius());

// etc