restore default (built-in) function after overriding

[sultanwadood]

Hi all.
I need to know how to restore or roll back to built-in function after overriding like following example.
String.prototyp e.substr= function()
{ return "";}
Now I want to use the one already built-in.
I shall be very thankful if some one could help me.
Sultan Wadood

[sultanwadood]

call built-in from overridden function of Object in javascript

Hi All.
Do any body know how to call built in function of object like substr from overridden version. I am trying following example but the function called itself recursively not the function being overridden.
String.prototyp e.substr= function(str)
{

return str.substr(0,5) ;
}

I shall be very thankful if some one could give me some hints.
Sultan Wadood.

[mrhoo]

You didn't override the function, you overwrote it- now you need to write a new function that does what the original one did, or use other methods that you have not improved to return a substring..

[sultanwadood]

yes
your are right it has actually been overwritten not overridden. but I want to switch back to the one which I have overwritten and to get rid of writting the function again.
thanks for reply.

[acoder]

Threads on same topic so I've merged them.