Join Strings in Query output

I have this query that "i'd like to convert to MongoDB. Is it possible to do this without resorting to javascript?

SELECT FirstName, Lastname, FirstName + " " + LastName AS FullName FROM Users

Also, I am using the most recent version of MongoDB


The only things that can "alter" the form of a returned document are .aggregate() and .mapReduce(). In this case, .aggregate() is the better form with $project and the $concat operator:

   { "$project": {
       "FirstName": 1,
       "Lastname": 1,
       "FullName": { "$concat": [ "$FirstName", " ", "$Lastname" ] }

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