[Fizzlemizz]

Tables with string keys are unordered but you can use pairs to return the key/values in whatever order they're found in.

ipairs is for a numerically orderd tables, the same as

for i=1, #table do
   -- return i, table[i] -- figurative return
end

for key, value in pairs(stringKeyedTable) do
    print(key, value)
end
 
for key, value in ipairs(numericKeyedTable) do
    print(key, value)
end

In your table, ItemTable, contains a list of sub-tables in numeric order. The sort, resorted them based on the ItemName key each sub-table has.