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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>JSON vs XML — types</title>
</head>
<body>
  <h1>Typed values</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var person = JSON.parse(`{
  "name": "Ada",
  "age": 36,
  "active": true
}`);

      document.getElementById("out").textContent = [
        typeof person.name,
        typeof person.age,
        typeof person.active,
        person.age + 1
      ].join("\n");
    })();
  </script>
</body>
</html>

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JSON vs XML — typed values (Try It)