title: Empty parentheses vs underscore for ES6 no-args arrow functions
body: <p>This is more of a code style question.</p>
  
  <p>In ES6, we can define arrow functions like so</p>
  
  <pre><code>let hello = () =&gt; console.log('world')
  </code></pre>
  
  <p>We can also replace <code>()</code> with <code>_</code> to save one character, but jslint warns that <code>_</code> is unused. 
  So my question is should one use underscore instead of empty parentheses?</p>