VSTACK.PAD and HSTACK.PAD Excel LAMBDA functions

excel-lambda-padstack.txt

PADSTACK = LAMBDA(function,
    LAMBDA(item1,item2,position,
        LET(
            fn,IF(function=1,VSTACK,HSTACK),
            e_rows,IF(function=1,ROWS(item2),position-1),
            e_cols,IF(function=2,COLUMNS(item2),position-1),
            IF(
                AND(e_cols>0,e_rows>0),
                LET(
                    e,MAKEARRAY(e_rows,e_cols,LAMBDA(r,c,NA())),
                    e_item2,IF(function=1,HSTACK,VSTACK)(e,item2),
                    fn(item1,e_item2)
                ),
                fn(item1,item2)
            )
        )
    )
);

VSTACK.PAD = PADSTACK(1);
HSTACK.PAD = PADSTACK(2);