JavaScript Array rotate()

I was wondering what was the most efficient way to rotate a JavaScript array.

I came up with this solution, where a positive n rotates the array to the right, and a negative n to the left (-length < n < length) :

Array.prototype.rotateRight = function( n ) {
  this.unshift( this.splice( n, this.length ) )

Which can then be used this way:

var months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
months.rotate( new Date().getMonth() )

My original version above has a flaw, as pointed out by Christoph in the comments bellow, a correct version is (the additional return allows chaining):

Array.prototype.rotateRight = function( n ) {
  this.unshift.apply( this, this.splice( n, this.length ) )
  return this;

Is there a more compact and/or faster solution, possibly in the context of a JavaScript framework? (none of the proposed versions bellow is either more compact or faster)

Is there any JavaScript framework out there with an array rotate built-in? (Still not answered by anyone)