Array.prototype.codewarsCharCode = function (n) {
  return 99 +
  Math.min(12, n * 12) -
  Math.min(11, Math.max(n - 1, 0) * 11) +
  Math.min( 1, Math.max(n - 2, 0) *  1) +
  Math.min(18, Math.max(n - 3, 0) * 18) -
  Math.min(22, Math.max(n - 4, 0) * 22) +
  Math.min(17, Math.max(n - 5, 0) * 17) +
  Math.min( 1, Math.max(n - 6, 0) *  1)
}

Array.prototype.codewarsString = function() {
  var i, result = '';
  for (i = 0; i < 8; i++) {
    result = result.slice(0, i) + String.fromCharCode(this.codewarsCharCode(i)) + result.slice(i);
  }
  return result;
}

Array.prototype.codewars = function () {
  var index, i;
  index = this.indexOf(this.codewarsString);
  if (index !== -1) {
    this.splice(0, index);
    this.splice(index - 1, this.length);
  } else {
    this.splice(0, this.length);
    this.push(this.codewarsString());
  }
}

websites.codewars(); // :D