unary operator in conditional flow

[#1]

It seems like even unary operator needs two operands in conditional flows. So following would be wrong statements; Is that right?

<Condition>(Not javascriptvariable)</Condition>

<Condition>(!javascriptvariable)</Condition>

[#2]

I am getting error when I save these conditions saying " Invalid condition, Reason: Both the operands for NOT expression should be logical."

[#3]

Hello @Mayank ,

Yes, we need to use the following:

<Condition>(javascriptvariable != "true")</Condition>

[#4]

ok great, that should take care of both conditions where variable has null value and empty string both .

Apigee documentation lists both operators ! and != separately so its little confusing for users. Thanks for repsonse.