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Operator [other Operator type actions]
Item [operators of similar scope]
Mathematical [other Mathematical operators]
Baseline
The concatenation operator, + (plus sign character), joins the strings/references/expressions before and after it. Thus, the expression
$FullName = "$FirstName"+" "+"$LastName"
evaluates a first name "Jane" and last name "Doe" to give a string value "Jane Doe" for the FullName attribute.
The + sign is also used for numerical addition. Depending on context, Tinderbox will decided which operation is intended by the + sign. This is a very good reason to always enclose literal text strings in quotes.