gistfile1.lua

S(
    windower.ffxi.get_items().treasure  -- This returns the treasure table.
)   -- S() creates a set out of the provided treasure table.
:map(   -- This function transforms the set.
        -- The function provided to :map is applied to every element in the set.
    table.get-{'item_id'}   -- This function takes a table and returns the field "item_id".
)

--[[
This means the function that retrieves the field "item_id" is applied to every element in
the set. I.e. it converts the set of tables containing treasure-slot information into a number,
the ID of the dropped item.
]]