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<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.5/angular.min.js"></script>
<meta charset=utf-8 />
<title>Extend!</title>
</head>
<body>
  <script>
    (function() {
      "use strict";
      var src1, src2, dst, rv;
      
      src1 = {
        a: "I'm a in src1",
        b: {name: "I'm the name property in b"},
        c: "I'm c in src1"
      };
      src2 = {
        c: "I'm c in src2"
      };
      
      // Shallow copy test
      dst = {};
      angular.extend(dst, src1);
      display("angular shallow copy? " + (dst.b === src1.b));
      dst = {};
      jQuery.extend(dst, src1);
      display("jQuery shallow copy? " + (dst.b === src1.b));
      $("<hr>").appendTo(document.body);
​
      // Return value test
      dst = {};
      rv = angular.extend(dst, src1);
      display("angular returns dst? " + (rv === dst));
      dst = {};
      rv = jQuery.extend(dst, src1);
      display("jQuery returns dst? " + (rv === dst));
      $("<hr>").appendTo(document.body);
​
      // Multiple source test
      dst = {};
      rv = angular.extend(dst, src1, src2);
      display("angular does multiple in order? " +
                  (dst.c === src2.c));
      dst = {};
      rv = jQuery.extend(dst, src1, src2);
      display("jQuery does multiple in order? " +
                  (dst.c === src2.c));
      
      function display(msg) {
        $("<p>").html(String(msg)).appendTo(document.body);
      }
    })();
  </script>
</body>
</html>
Output 300px

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