code: function(arr) {
          if (Array.prototype.from) return Array.from(new Set(arr));
          return arr.filter(function(v,i,a) {
            return i === a.indexOf(v);
          });
        }
docs: Takes an array with duplicates and returns a new one with all dupes removed.
  
  unique :: (arr) → arr
  
  @param arr
  @returns A new array with duplicates removed