Best way to `shift` a frozen array?

[Dave Everitt]

I just came across the fact that nanoc freezes arrays from the YAML metadata in content files, so won't respond to shift etc. I have different length lists of tabs on several pages, only the first of which always needs class="active". Then I want to loop through the remaining array items (omitting the first). I managed this in the layout by using dup to 'shallow copy' the frozen array, then using shift on the array copy as follows:

  <ul class="tabs">

    <li><a class="active" href="#<% t = @item[:tabs].dup; t1 = t.shift %><%= t1 %>"><%= t1 %></a></li>

    <% t.each do | i | %>

    <li><a href="#<%= i %>"><%= i %></a></li>

    <% end %>

  </ul>

YAML example:

tabs:

- tab1

- tab2

- tab3

...

Just wondering if there's a cleaner, DRYer way? I want to hard-code the class into the output - my existing Javascript handles the tabs nicely that way.

[Choan Gálvez]

For the first part, you can just use `item[:tabs].first` to access the
first element.

For the iteration, apply each on a slice: `item[:tabs][0..-1].each`.

Alternatively, you can use `item[:tabs].each_with_index` and use just
one loop.

Best.
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[Dave Everitt]

That works! But I ended up with this:

  <ul class="tabs">

    <% @item[:tabs].each do | i | %>

    <li><a <% if i == @item[:tabs][0] %>class="active" <% end %>href="#<%= i %>"><%= i %></a></li>

    <% end %>

  </ul>

as I'm after Ruby 1.8.7 compatibility (and I think .each_with_index needs 1.9) but thanks for the tips :-)