title: How to stop binding every handler and declaring variable 'that'
body: <p>I feel doing unnecessary routine, when I bind variables</p>
  
  <pre><code>this.handleInputChange = this.handleInputChange.bind(this);
  </code></pre>
  
  <p>or declare <code>that = this</code> in order to use current object in an async handler.</p>
  
  <p>Is there a way to handle this routine in a prototype?</p>