Module:No globals: Difference between revisions

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    m>Jackmcbarn
    (rm name exception)
    m (4 revisions imported from wikipedia:Module:No_globals: see Topic:Vtixlm0q28eo6jtf)
     
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    (No difference)

    Latest revision as of 11:43, 21 May 2021

    Documentation for this module may be created at Module:No globals/doc

    local mt = getmetatable(_G) or {}
    function mt.__index (t, k)
    	if k ~= 'arg' then
    		error('Tried to read nil global ' .. tostring(k), 2)
    	end
    	return nil
    end
    function mt.__newindex(t, k, v)
    	if k ~= 'arg' then
    		error('Tried to write global ' .. tostring(k), 2)
    	end
    	rawset(t, k, v)
    end
    setmetatable(_G, mt)