code: function difference(arr1, arr2) {
      var ret = arr1, args = flatten(argsToArray(arguments, 1));
      if (isArray(arr1)) {
          ret = filter(arr1, function (a) {
              return indexOf(args, a) === -1;
          });
      }
      return ret;
  }
docs: Finds the difference of the two arrays.
  
  @example
  
  comb.array.difference([1,2,3], [2,3]); //[1]
  comb.array.difference(["a","b",3], [3]); //["a","b"]
  
  @param {Array} arr1 the array we are subtracting from
  @param {Array} arr2 the array we are subtracting from arr1
  @return {*} the difference of the arrays.
  
  @static
  @memberOf comb.array