def map(&block)
      return self.to_enum(:map) unless block_given?
      arr = []
      self.each_row do |row|
        arr.push(row.instance_eval(&block))
      end
      Mikon::Series.new(:new_series, arr, index: @index.clone)
    end
def map(&block)
      return self.to_enum(:map) unless block_given?
      arr = []
      self.each_row do |row|
        arr.push(row.instance_eval(&block))
      end
      Mikon::Series.new(:new_series, arr, index: @index.clone)
    end
Iterate rows using Mikon::Row DSL and return new Mikon::Series