code: function insert(seq, index) { var values, result
          values = slice(arguments, 2)
          result = copy(seq)
          result.splice.apply(result, [index, 0].concat(values))
  
          return result
      }
docs: /// Function insert //////////////////////////////////////////////////////  (seq:Sequence, index:Num[, values...]) ↦ Array  Returns a array with the given elements inserted at the given index.