/* Builtin Constructor 1 */
var newCircle = new Object();
newCircle.area = function (r) {
return r * Math.PI;
};
newCircle.toString = function (r, unit) { // buitin func toString()
unit = (unit === "international" ? "mm" : "inch"); // Ternary
return "Radius = " + this.area(r) + " " + unit;
};
var element = document.getElementById("result");
element.innerHTML = newCircle.toString(10, "international");