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Asked: 2026-05-12T06:47:42+00:00

Just wonder. I have extended javascript Array object using its prototype as follows: <html>

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Just wonder.
I have extended javascript Array object using its prototype as follows:

<html>
<head>
</head>
<body>
<script type="text/javascript">
  function SomeMethod(){
  alert('Hello');
  }
  if(typeof Array.prototype.SomeMethod ==='undefined' ){
    Array.prototype.SomeMethod = SomeMethod;
  }
  var ax=new Array("A","B","C");
  for(var i in ax){
    document.write(ax[i]);
  }
</script>

</body>
</html>

The result will be:

ABCfunction SomeMethod() { alert("Hello"); }

EDIT:
Although I have already found the answer I feel the necessity to add some
more information so it would be clearer for others.

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1 Answer

  1. Editorial Team

    for..in iterates over the (non built-in) properties of an object. Do not use it to iterate through an array. Just use a regular for loop.

    Read this link https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Statements/for…in#Description

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