<%= badge '3' %>
<span class="badge">3</span></a>A basic badge.
<%= badge '4', data => { custom => 'yes' }, right %>
<span class="badge pull-right" data-custom="yes">4</span>A right aligned badge with a data attribute.
%= badge 'Badge 2', right
<span class="badge pull-right">Badge 2</span>
% my $empty_badge = ''; %= badge $empty_badge
A badge with undef value or empty string is not rendered.