title: What does ' !!window.google ' mean?
body: <p><a href="https://i.stack.imgur.com/0knL6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0knL6.png" alt="enter image description here"></a></p>
  
  <p>I'm reading through <a href="https://markus.oberlehner.net/blog/using-the-google-maps-api-with-vue/" rel="nofollow noreferrer">https://markus.oberlehner.net/blog/using-the-google-maps-api-with-vue/</a> . In the section in the screenshot the author uses:  </p>
  
  <pre><code>let initialized = !!window.google;
  </code></pre>
  
  <p>What does this mean?</p>