Array Move to Back

/*
 * This function moves the nth member of the array to the end
 */
Array.prototype.move2Back = function(n) {
  this.push(this.splice(n,1).pop());
  return this;
}

var arr = ["Jani","Hege","Stale","Kai Jim","Borge","Tove"];

console.log(arr.move2Back(3));