Excel: How to use an Array to concatenate strings that are next to a criteread section (If function)

Question

Good Day Everyone

I have an Excel sheet as bellow in two columns. I know how to use an array if function with sum to add up all values next to a column that has met

Answer 1

If I'm assuming you don't want the relatively easy VBA solution where you recurse through the initial list and concatenate the answers then you could put the following into B8:

=IFERROR(INDEX(Sheet1!$A$1:$A$6,SMALL(IF(Sheet1!$B$1:$B$6=$A8,ROW(Sheet1!$B$1:$B$6)-ROW(Sheet1!$B$1)+1),COLUMNS($B1:B1))),"")

You'd have to drag it across as it'll put them in separate columns but then you should be able to concatenate them into a single column afterwards.

You have to have Ctrl and Shift held down when inputting as it's an array formula.