Usage of StringTemplate

Question

The documentation for StringTemplate has the following example

In[1]:= StringTemplate[
  "The first `1` Fibonnaci numbers are: <* Table[Fibonacci[n+1],{n,#1}] // Row *>."][5]

Out[1]= "The first 5 Fibonnaci numbers are: 1, 2, 3, 5, 8."

However, when used in Mathematica, we get the following output

In[31]:= StringTemplate[
  "The first `1` Fibonnaci numbers are: <* Table[Fibonacci[n+1],{n,#1}] // Row *>."][5]

Out[31]= "The first 5 Fibonnaci numbers are: 12358."

How can one get the output with the commas between the numbers (i.e., like 1, 2, 3, 5, 8)?

Answer 1

The documentation example is clearly wrong. Probably was written without proper testing. A second argument giving a spacer element must be added to Row. The quotes delimiting the spacer string must be escaped.

StringTemplate[
  "The first `1` Fibonnaci numbers are: <* \
     Row[Table[Fibonacci[n+1],{n, #1}],\", \"] *>."][5]

"The first 5 Fibonnaci numbers are: 1, 2, 3, 5, 8."

Answer 2

I would say that there may be a mistake in the documentation. In order to get the comma separated format, you should provide an explicit separator to Row:

StringTemplate["The first `1` Fibonacci numbers are: <* Row[Table[Fibonacci[n + 1], {n, #1}], \", \"] *>."][5]