Using Google Sheets ARRAYFORMULA to Concatenate Series of Item Based from Lowest to Highest Values per Row

I have a table with three Columns:
Column A: name of Item,
Column B: Lowest value of series,
Column C: the Highest value of series.
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What I want to achieve is:

1. Generate series of item sequence from lowest number to highest number per row

So Apple 7 9 will yield: "Apple_7", "Apple_8", "Apple_9"

2. Concatenate/Join such sequence per row into Column D
   So

   Item	From	Until	Result
   Apple	7	9	"Apple_7, Apple_8, Apple_9"
   Berry	3	8	"Berry_3, Berry_4, Berry_5, Berry_6, Berry_7, Berry_8"

3. Doing it all using one Arrayformula, so that new row added can be automatically calculated.

Here is example sheet: https://docs.google.com/spreadsheets/d/1R5raKmmt5-aOIorAZGHjv_-fdySKWjCMB_FRQwm1vag/edit#gid=0

I tried in Column D:

arrayformula(textjoin(", ",true,arrayformula(A3:A&"_"&sequence(1,C3:C-B3:B+1,B3:B,1))))

Apparently, the sequence function only take value from Column B and join it in first row.

Any help will be appreciated.

>Solution :

Try below BYROW() formula (see your file, harun24hr sheet).

=BYROW(A3:INDEX(A3:A,COUNTA(A3:A)),LAMBDA(x,TEXTJOIN(";",1,INDEX(x&"_"& SEQUENCE(INDEX(C:C,ROW(x))-INDEX(B:B,ROW(x))+1,1,INDEX(B:B,ROW(x)))))))

• Here A3:INDEX(A3:A,COUNTA(A3:A)) will return a array of values as well cell reference from A3 to last non empty cell in column A (Assume you do not have any blank rows inside data). If you have blank row, then you have to use different approach. See this post by @TheMaster

• Then LAMBDA() will apply TEXTJOIN() and SEQUENCE() function for each cell of B as well as C column.

• SEQUENCE() will make series from start to end number and by concatenating A column and will generate your desired strings.

• Finally TEXTJOIN() will join all those strings with delimiter to a single cell.