'kw'>def</span> <span class='id identifier rubyid_transform_and_join'>transform_and_join</span><span class='lparen'>(</span><span class='id identifier rubyid_data'>data</span><span class='comma'>,</span> <span class='label'>controller:</span><span class='comma'>,</span> <span class='op'>&amp;</span><span class='id identifier rubyid_transform_block'>transform_block</span><span class='rparen'>)</span>
  <span class='kw'>if</span> <span class='id identifier rubyid_data'>data</span><span class='period'>.</span>