js coercion on property access and method calls on primitive values

coercing.js

var s;

s = "wtf";
s.split = function () {};
s.split("t"); // split() works

s = String("wtf");
s.split = function () {};
s.split("t"); // split() works

s = new String("wtf");
s.split = function () {};
s.split("t"); // split() does not work

// why?
// - properties or methods of primitive values (e.g. "" or String("")) are converted to their respective objects (new String("")) before the property or method is called.
// - this is also true for other primitive types e.g. 2 and Number(2) vs. new Number(2)

// references:
// http://es5.github.io/#x11.2.1
// http://es5.github.io/#x8.7.1
// http://princepthomas.blogspot.no/2011/07/auto-boxing-javascript-primitive-types.html