This example shows that private variables created with module pattern may not be as private as you think.

module-pattern-whoopsie

var foo = (function () {

	// create a private variable
	var priv = [];

	// expose getter/setter
	return {
		getPriv: function () {
			return priv;
		},

		setPriv: function (x) {
			priv = x;
		}
	}
}());

// Can we set it?
foo.setPriv([1, 2, 3]);

// Can we get it?
console.log(foo.getPriv());  // [1, 2, 3]

// Is priv private?
console.log(foo.priv);  // undefined

// Is it *really* private?
foo.getPriv().splice(1, 1);
console.log(foo.getPriv());  // [1, 3]