Why does alert() output undefined?

R

ras_gan2020-04-24 11:47:47

JavaScript

ras_gan, 2020-04-24 11:47:47

<html>
  <body>
    <script>
      var name, admin;
      name = "John";
      name = admin;
      alert(admin);
    </script>
  </body>
</html>

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