title: ReactJS toLowerCase is not a function
body: <p>I am doing a comparison by converting my text to lowercase and comparing its index to -1, in order to have some value to the particular field in <code>ReactJS</code>, but I am getting this error in JavaScript console:</p>
  
  <blockquote>
    <p>Uncaught TypeError: props.filterText.toLowerCase is not a function</p>
  </blockquote>
  
  <pre><code>var props = this.props;
  var rows = this.props.episodes
      .filter(function(episode){
          return episode.title.toLowerCase().indexOf(props.filterText.toLowerCase()) &gt; -1;
      })
      .map(function(episode){
         return &lt;EpisodeRow key={episode.title} episode={episode}/&gt;
      });
  </code></pre>