Passing by Reference Versus Passing by Value : Function « Language Basics « JavaScript DHTML






  1. JavaScript DHTML
  2. Language Basics
  3. Function

Passing by Reference Versus Passing by Value

   

/*
JavaScript Unleashed, Third Edition
by Richard Wagner and R. Allen Wyke 

ISBN: 067231763X
Publisher Sams CopyRight 2000

*/

<html>
<head>
  <title>JavaScript Unleashed</title>
  <script type="text/javascript">
  <!--
    // wrap and integer inside an object
    function intObject() {
      this.i;
      return this;
    }
   
    function start() {
      // declare two ways to store an integer
      var I;
      var myIntObject = new intObject();
   
      // assign initial values
      i = 0;
      myIntObject.i = 0;
   
      // display current values
      document.write("<br>Before<br>");
      document.write("i = " + i);
      document.write("<br>");
      document.write("myIntObject = " + myIntObject.i);
      document.write("<br>");
   
      // pass variables
      modify(i, myIntObject);
   
      // display current values
      document.write("<br>After<br>");
      document.write("i = " + i);
      document.write("<br>");
      document.write("myIntObject = " + myIntObject.i);
      document.write("<br>");
    }   
    function modify(n, obj) {
      n++;
      obj.i++;
    }
  //-->
  </script>
</head>
<body>
  <script type="text/javascript">
  <!--
    start();
  //-->
  </script>
</body>
</html>








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