title: Concatenate two character vectors
body: <p>I have these two character vectors as shown below -</p>
  <pre><code>x &lt;- c(&quot;Beef/Pork&quot;, &quot;Sugar sweeteened bev.&quot;,&quot;Total fruit&quot;)
  y &lt;- c(&quot;beefpork&quot;, &quot;ssb&quot;, &quot;total_fruit&quot;)
  </code></pre>
  <p>I want to create another vector based on this (like below). I need this to put it in <code>selectInput( )</code> in shiny.</p>
  <pre><code>choiceVec &lt;- c(&quot;Beef/Pork&quot; = &quot;beefpork&quot;,
                 &quot;Sugar sweeteened bev.&quot; = &quot;ssb&quot;,
                 &quot;Total fruit&quot; = &quot;total_fruit&quot;)
  </code></pre>