<%= badge '3' %>
    <span class="badge">3</span></a>
A basic badge.
3
    <%= badge '4', data => { custom => 'yes' }, right %>
    <span class="badge pull-right" data-custom="yes">4</span>
A right aligned badge with a data attribute.
4
    %= badge 'Badge 2', right
    <span class="badge pull-right">Badge 2</span>

Badge 2
    % my $empty_badge = '';
    %= badge $empty_badge

A badge with undef value or empty string is not rendered.