title: Flutter scope of context instance
body: <p>Referring to an official <a href="https://codelabs.developers.google.com/codelabs/first-flutter-app-pt2/#5" rel="nofollow noreferrer">Flutter tutorial</a>, how is <code>context</code> referable in 
  the <code>_pushSaved()</code> function?</p>
  
  <pre class="lang-dart prettyprint-override"><code>class RandomWordsState extends State&lt;RandomWords&gt; {
    ...
    void _pushSaved() {
      Navigator.of(context).push(
        ...
      );
    }
  }
  </code></pre>