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How about

t = { a = 1, b = 2, c = 3, [4] = 4}
local k = next(t)
while k do
  t[k] = nil
  k = next(t)
end



Is this OK?

t = { a = 1, b = 2, c = 3, 4 = 4}

for k in pairs (t) do
   t [k] = nil
end -- for