t>
<dd><p>Function to be run within each column, should return a value or
vectors with same length.</p></dd>

</dl></div>
    <div id="value">
    <h2>Value</h2>
    <p>data.table</p>
    </div>
    <div id="see-also">
    <h2>See also</h2>
    <div class="dont-index"><p><code><a href="select.html">select_dt</a></code>, <code><a href="https://dplyr.tidyverse.org/reference/case_when.html" class="external-link">case_when</a></code></p></div>
    </div>

    <div id="ref-examples">
    <h2>Examp