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Array.prototype.unique = function (sort, sortingFunction) {
  var array = [];
  for (var i = 0; i < this.length; i++) {
    if (array.inArray(this[i]) === false)
      array.push(this[i]);
  }
  if (sort === true) {
    if (typeof sortingFunction === 'function')
      array.sort(sortingFunction);
    else
      array.sort();
  }
  return array;
};