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Cory Bloyd wrote:

for key, value in pairs(someTable) do
      if someArbitraryCondition() then
            someTable[newKey()] = newValue()
      end
end
If you are not short in memory, you can iterate on someTable and copy existing keys and creating new keys in a new table. Then replace someTable with newTable and you are safe. 

--
Philippe Lhoste
--  (near) Paris -- France
--  http://Phi.Lho.free.fr
--  --  --  --  --  --  --  --  --  --  --  --  --  --