How to determine if a string variable is blank?

[ericonline]

How is this accomplished? Now that the advanced editor is missing from Conditions, I don't know how to check to see if a string is empty!

Previously I'd do something like @{empty(variables('varName'))} in the condition. 

[Gristy · Accepted solution]

you can use null in a express on the right side

or

use length(var) on the left is greater than 0.

[abm · Accepted solution]

Hi @ericonline 

Did you tried using the length expression?

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Thanks

[RezaDorrani · Accepted solution]

Hi @ericonline 

You can still use the old expression @{empty(variables('varName'))}

just this time becuase its being used in a  condition

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[ericonline]

I've tried @RezaDorrani 's solution and it worked. I'll mark all three of your suggestions as a solution as I'm sure they also work.

Thank you very much!

[djbryson]

No, you can't use a null expression with a string variable.   A condition that checks if a string variable is not null will always come true, because it's not null, it's an empty string.  Use empty or length.