ASP Function overwriting the parameter variable

Hey Everyone,

I have run into an issue where an ASP function is acting as if I am sending a variable as ByRef, but I am not.

Here is the function:

function convertToMetric(strImperialValue)

if isNull(strImperialValue) then strImperialValue = ""

if isNumeric(strImperialValue) then strImperialValue = cdbl(cdbl(strImperialValue) / 0.03937)

convertToMetric = strImperialValue

end function


Expected use:

varMetric = convertToMetric(varImperial) & " mm"


varMetric does get set to the metric value, but so does varImperial

I can fix the problem by changing the code to the following:
function convertToMetric(strImperialValue)

dim strVal

strVal = strImperialValue

if isNull(strVal) then strVal= ""

if isNumeric(strVal) then strVal= cdbl(cdbl(strVal) / 0.03937)

convertToMetric = strVal

end function

I would like to know what is causing the problem as I use nearly identical functions elsewhere without any issues.

Any ideas?

Thanks,
Dan

Also, adding ByVal to the function seemed to work.

I've never had classic ASP require me to pass ByVal before though.

After further reading, apparently ASP defaults to ByRef - never read this before