lua metatable

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t = setmetatable({ bar = 4, foo = 7 }, { __index = { foo = 3 } })
print(t.foo)  – 7

print(t.bar)  – 4
t = setmetatable({  }, { __index = { foo = 3} })
print(t.foo)  – 3

print(t.bar)  – nil
fuc = function (t,k)

if k == 'foo' then

return rawget(t, 'bar')

else

return 0

end

end
t = setmetatable({   }, { __index = fuc })
print(t.foo)  – 3

print(t.bar)  – nil

print(t.ff)