Textjoin in a sequence within a range

Question

I'm trying to textjoin a range with a delimiter:

Is there a way to textjoin this into a sequence every 3 cells within a range

I know I can do it with: A1&B1&C1&"-" etc. but my range is too great for that A until XXX and I need to ignore blank cells within that range

Answer 1

Simple:

=TEXTJOIN({"","","-"},TRUE,A1:I1)