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Editorial Team
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Asked: 2026-06-04T12:04:41+00:00

I have following Html file with javascript. This gives me error that testCircle is

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I have following Html file with javascript. This gives me error that “testCircle is undefined.” kinldy help me resolve this.

<html>
    <body>
    <h1> Testing Object-based Javascipt </h1>
    <script type="text/javascript">
    function mycircle(x,y,r)
    {
    this.xcoord=x;
    this.ycoord=y;
    this.radius=r;
    this.area = getArea;
    this.getCircumference = function () { return (2 * Math.PI * this.radius ) ; };
    }
   function getArea()
   {
   return (Math.PI * this.radius * this.radius);
   }
        var testCircle = mycircle(3,4,5);

   window.alert('The radius of my circle is ' + testCircle.radius);

   </script>

   </body>
   </html>

Thanks in advance….

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1 Answer

  1. Editorial Team
    var testCircle = mycircle(3, 4, 5);

    should be

    var testCircle = new mycircle(3, 4, 5);

    Constructors are to be called with the new keyword. If the keyword is not used, you’re assigning the return value of the mycircle function. And as mycircle contains no return statement, the return values is undefined – that’s what you assigned to testCircle in your code.

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