var o = {};
o.constructor === Object; // true

var a = [];
a.constructor === Array; // true

var n = new Number(3);
n.constructor === Number; // true



var o = {};
typeof o === "object"; // true

var a = [];
typeof a === "object"; // true

var n = new Number(3);
typeof n === "number"; // false

var n = 3;
typeof n === "number"; // true


  function mydate() {

  }
  mydate.prototype = Date.prototype;

  mydate.constructor === Function; // true

function hello(howareyou) {
	this.howareyou = howareyou;
}

var cool = new hello("cool");
cool.constructor === hello; // true