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Variable scoping in Java script

Posted Date: 10 Oct 2008 Resource Type: Code Snippets Category: Javascript

Posted By: Bindu Bujji Member Level: Gold
Rating:

Points: 10

This example showed how globally and locally declared and scoped variables are seen from inside and outside a function.

Below need to put in script tag of the HEAD TAG


 var aNewVariable = "is global.";
   function doSomething(incomingBits) {
     alert("Global variable within the function is : " + aNewVariable);
     alert("Local variable within the function is : " + incomingBits);
    }

Now in the script tag which is Inside the BODY tag.


    doSomething("is a local variable");
    alert("Global var outside the function: " + aNewVariable);
    alert("Local var outside the function: " + incomingBits);

The output is like this..it display in alert box though.
=======================================================
Global Variable wtihin the function is: is global
Local variable within the function is: is a local variable
Global var outside the function: is global

Responses

Author: Pradeep Y 24 Oct 2008 Member Level: Gold Points : 1

hi Bindu,

Please also explain how the program works.

Regards,
Pradeep

Author: Bindu Bujji 30 Oct 2008 Member Level: Gold Points : 2

Hi Pradeep,
The alert box messages itself tells you the scope of the variable. If you don't understand, pl get back to me.....

This is just scope of the variable inside the function and outside the function. Try yourself using some numbers, u will get more idea.

Author: Pradeep Y 31 Oct 2008 Member Level: Gold Points : 0

hi bindu,

Thanks for your reply...

TC

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