Module:Format ISBN/data explained

--

local hyphen_pos_t =

--local index_t = ; -- index into ; we will binary search the index; init to 'zero' as

for key, _ in pairs (hyphen_pos_t) do -- pairs because indexes of are not monotonically increasing table.insert (index_t, key); -- add the key from to as valueend

table.sort (index_t); -- and ascending sortlocal count = #index_t; -- extract the count here because can't do it in Module:Format ISBN (there, #index_t returns 0)

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return