We have a form that asks for the students first name and last name. I am trying to using concatenate and an array formula to display "Lastname.Firstname".

I used:


but it displays all the last name, a period, then all the first names - looking like this smithjohnsonjackson.johngeorgeharry. What am I doing wrong?

  • perhaps try it like this:

    =ARRAYFORMULA(IF(LEN(A:A), B:B&"."&A:A, ))


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