title: destruction es6 default value in react's props
body: <p><code>&lt;ComponentB from="3/1/2016" to="12/1/2016" /&gt;</code></p>
  
  <p>and in componentB's constructor I can do </p>
  
  <p><code>const { from, to } = this.props</code> but my from to value is optional. I can't do </p>
  
  <p><code>this.state = { from, to }</code> if they are or null. Any way to set default value for destruction?</p>
  
  <p>I can do <code>if(from &amp;&amp; to) {}</code> but just curious what's the best way to handle optional props in react.</p>