I saw such a example code in APPIAN DEVELOPER course practice document. (Expressions: Transform Your Data, Build an Application: Step 4)
I couldn't understand why if() coukd take arguments more than 3. The usage of if() should be "if(condition, valueIfTrue, valueIfFalse)" according to official doc.
proper( if( isnull(ri!user), "", isusernametaken(ri!user), user(ri!user, "firstName") & " " & user(ri!user, "lastName"), joinarray(split(ri!user, "."), " ") ) )
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