Overloading _.intersection

gistfile1.txt

var arr1 = [1,2,3]
  ,arr2 = [2,3,4]
  ,arr3 = [3,4,5];

function overloadIntersection() {
  var cached = _.intersection;
  _.intersection = function() {
    var rest = arguments, arr = [];
    if(rest.length == 0) { 
      throw "You must pass at least one array to _.intersection."
    }    
    arr = rest.length == 1 ? rest[0] : rest;
    return eval(_.reduce(arr, function(m, v, i) { return m + 'arr['+i+'],'; }, 'cached(').slice(0, -1) + ')');
  }
}

overloadIntersection();
console.log(_.intersection([arr1, arr2, arr3]));
console.log(_.intersection(arr1, arr2, arr3));