class Prawn::Table::Cell

def style(options={}, &block)


cell.border_width = 2
cell.padding = 0

is the same as:

cell.style(:padding => 0, :border_width => 2)

Supports setting multiple properties at once. 
def style(options={}, &block)
  options.each do |k, v|
    send("#{k}=", v) if respond_to?("#{k}=")
  end
  # The block form supports running a single block for multiple cells, as
  # in Cells#style.
  block.call(self) if block
end