More Zebras

Update: OK, you got me. You should really use the built-in Rails helper, cycle.

<table class="Grid">
 <% for user in @users %>
  <tr class="<%= cycle('Even', 'Odd') %>">
    <td>
      ... Stuff Here
    </td>
  </tr>
 <% end %>
</table>

Here's the helper I've been using lately for zebra striping table rows:

def zebra_stripe( index, even_class="Even", odd_class="Odd" )
  index % 2 == 0 ? even_class : odd_class
end

In the view, you use the rubyesque .each_with_index like this:

<table class="Grid">
<% @users.each_with_index do |user, i| %>
  <tr class="<%= zebra_stripe(i) %>">
    <td>
      ... Stuff Here
    </td>
  </tr>
<% end %>
</table>

Simple as that!