Problem occurred while Prototyping Arrays

[Velhari]

Hi all,

I am used prototype concept in javascript. But here i got a problem while printing arrays.

Array.prototype.count = function()
{
    Input = this;
    document.writeln("<br>");
    for ( key in Input )
        document.writeln( "["+key+"]" + "=>" + Input[key] );
}
 
var d = new Array(1,1,1,1,5,"adfasdfasdf");
d.count();

The output look like

[0]=>1 
[1]=>1 
[2]=>1 
[3]=>1 
[4]=>5 
[5]=>adfasdfasdf
[count] = function() { Input = this; document.writeln("
"); for ( key in Input ) document.writeln( "["+key+"]" + "=>" + Input[key] );}

It print the array content and it also print the native code.
Why it prints the native code?
Anything to suppress this printing of native code?

[mrhoo]

When you add a property to an object, even if it is a native object, you are not adding native code.

A for in loop always returns user defined properties. Loop through an array using it's length and item indexes-

Array.prototype.count=function(){
  var L= this.length,A= [];
  for(var i= 0; i< L; i++) {
        A[i]=(i+1)+ '. '+ this[i];
   }
  return A.join('\n');
}