title: Why doesn't dplyr have a function combining assignment and piping?
body: <p>An extremely common use of piping is to modify a variable. For example,</p>
  
  <pre><code>x &lt;- x %&gt;% mutate()
  </code></pre>
  
  <p>It would be nice if there was an operator that both assigned and piped, say</p>
  
  <pre><code>x %&lt;% mutate()
  </code></pre>
  
  <p>Is there such a thing and I just don't know about it? </p>