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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  <script>
    (function() {
      var a = {foo: "bar"};
      var b = {bar: "charlie"};
      var cache = {};
      
      cache[a] = "Hi there";
      display(cache[b]);
      
      function display(msg) {
        var p = document.createElement('p');
        p.innerHTML = String(msg);
        document.body.appendChild(p);
      }
    })();
  </script>
</body>
</html>
Output 300px

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anonymouspro
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