rue"></a>}</span>
<span id="cb18-6"><a href="#cb18-6" aria-hidden="true"></a>ans &lt;-<span class="st"> </span><span class="kw">foo</span>(flights)</span>
<span id="cb18-7"><a href="#cb18-7" aria-hidden="true"></a><span class="kw">head</span>(flights)</span>
<span id="cb18-8"><a href="#cb18-8" aria-hidden="true"></a><span class="co">#    year month day dep_delay arr_delay carrier origin dest air_time distance hour</span></span>
<span id="cb18-9"><a href="#cb18-9" aria-hidden="true"></a><span class="co"># 1: