Sum datagrid column values

Question

I am looking for a way (action script code?) to sum datagrid
column values.
I am using Flex2 with Cold Fusion MX7.
I populate a DataGrid by setting dataprovider to the result
of a Coldfusion query.
(this.masterList.dataProvider = event.result as
ArrayCollection;)
This all works fine.
The masterList datagrid has debit, credit, and unitcost
columns. I want to sum those columns individually, and display the
results in text boxes in another panel.
I could run a Coldfusion query to return the sums, but would
like to do it on the client side with action script.
I want to sum them everytime I update the datagrid, so need
action code that I can put in the result function.
I am new to ActionScript, and not sure how to loop through
the array collection(and/or) dataprovider and sum the items.
Any help would be appreciated.
Thanks.

Answer 1

Loop through your array..if the arrayCollection was named
myArray;
private sumFunction():Number{
var sum:Number=0;
for(var i:uint=0;i<myArray.lenght;i++){
sum+=myArray
.debitValue;
return sum;