Conditionally set variables

I am trying to set a variable conditionally using a if/then statement but cant seem to get it to work using formcalc
here are a few examples of what I have tried
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if (textField1.rawValue == null) then
var myVar = "?"
else
var myVar = textField1.rawValue
endif

--------------------------------------

if (textField1.rawValue.isNull) then
var myVar = "?"
else
var myVar = textField1.rawValue
endif

I also tried declaring the variable befor running the if statement using

var myVar

I can seem to get it to set the variable based on wether the text field is empty... It has to be something stupid and simple I am missing.