"op">=</span> <span class="cn">NA</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "hello" NA     </span>
<span class="r-in"><span><span class="fu">str_fill</span><span class="op">(</span><span class="va">x</span>, na <span class="op">=</span> <span class="st">"(missing)"</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "hello    " "(missing)"</span>
<span class="r-in"><span></span></span>
<span c