Javascript Array rotate(n)

Array.prototype.rotate = function (n) {
  if (n > 0) {
    return this.slice(n).concat(this.slice(0, n))
  } else {/*from w  w w .ja  v a  2 s  . com*/
    return this.slice(this.length + n).concat(this.slice(0, this.length + n))
  }
}

console.log("hello mlbam team");

Array.prototype.rotate = function(n) {
 this.unshift.apply(this, this.splice(n + 1, this.length))
 return this;//ww w  . j ava 2  s  . c om
}

var arr = [1, 2, 3, 4, 5];
var arr1 = [1, 2, 3, 4, 5];

/*
* Implement a function rotateArray(vector<int> arr, int r) 
which rotates the array by r places. Eg 1 2 3 4 5 on being rotated by 2 gives 4 5 1 2 3.
*/
var rotate = function(arr, r) {
 arr.unshift.apply(arr, arr.splice(r + 1, arr.length));
};

rotate(arr, 2);
console.log(arr);
// arr1.rotate(2);
// console.log(arr1);