title: Warning: Expected an assignment or function call and instead saw an expression
body: <p>I'm checking out the documentation source file <a href="https://github.com/PitPik/colorPicker/blob/master/index.js" rel="nofollow">index.js</a> from <a href="https://github.com/PitPik/colorPicker" rel="nofollow">this library</a>. I checked up the code in jshint, and there's a warning saying:</p>
  
  <blockquote>
    <p>Expected an assignment or function call and instead saw an expression.</p>
  </blockquote>
  
  <p>File: <a href="https://github.com/PitPik/colorPicker/blob/master/index.js#L215" rel="nofollow">index.js Line: 215</a></p>
  
  <pre><code>s = (Math.sqrt((x * x) + (y * y)) / r) * 100;
  </code></pre>
  
  <p>Why am I getting the warning, and how can I fix it?</p>