From: Trans <transfire@...>
Date: 2008-03-01T03:32:43+09:00
Subject: Re: possible to optimize this?



On Feb 29, 10:45 am, laredotornado <laredotorn...@zipmail.com> wrote:
> Hi,
>
> I am creating a variable "counter" to count the number of iterations.
> But I get the funny feeling Ruby (I'm using 1.8) may already have some
> kind of implicit counter in the loop.  Does anyone know of a way the
> below can be optimized?
>
> <% counter = 0 %>
> <% @ec_orders.each do |ec_order| %>
>   <tr <%= classify(counter) %>>
>     <td><%=h ec_order.ship_first_name %></td>
>     <td><%=h ec_order.ship_last_name %></td>
>     <td><%=h ec_order.invoice_num %></td>
>     <td align="center"><%= link_to 'View', {:action => 'view', :id =>
> ec_order.id} %></td>
>   </tr>
>   <% counter += 1 %>
> <% end %>

There is no implicit counter. I've often wished there were --an 'it'
keyword that can provide information about each iteration. But certain
people don;t seem to like that (not sure why since $1, seems perfectly
acceptable). But I'm also guessing that it might have too much of a
speed hit on iterative loops.

In any case there is each_with_index. Facets has #collect_with_index
if you need it --which in 1.9, I believe becomes
array.collect.with_index.

T.