def coffees_html
  coffees = []
  $coffees.each do |coffee|
    coffees << "<div>#{ coffee[:what] } $#{ coffee[:cost] }</div>"
  end
  coffees.join("<br>")
end

def coffees_html
  $coffees.map { |coffee|
    "<div>#{ coffee[:what] } $#{ coffee[:cost] }</div>"
  }.join("<br>")
end