when $.each is called with an object, that has an attribute named length, it does not iterate over the object:

var humpty = {
  'length' : 'foobar'
};
$.each(humpty, function (i, n) {
  alert('$.each: ' + i);
});

Using the traditional for-in-way it works:

for( objKey in humpty ) {
  alert('for in: ' + objKey);
}

In the function it is only tested whether length is not equal to undefined.

The function should check the nature of the object to iterate over differently:

// perhaps:

iterObj.constructor === Object

iterObj.constructor === Array