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"Sorted by key" table iterator

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  1. -- "Sorted by key" table iterator 
  2. -- Extracted from http://www.lua.org/pil/19.3.html
  3.  
  4. function pairsKeySorted(t, f)
  5.     local a = {}    
  6.     for n in pairs(t) do
  7.         table.insert(a, n)
  8.     end    
  9.     table.sort(a, f)
  10.  
  11.     local i = 0      -- iterator variable
  12.     local iter = function ()   -- iterator function
  13.         i = i + 1
  14.         if a[i] == nil then
  15.             return nil
  16.         else
  17.             return a[i], t[a[i]]
  18.         end
  19.     end
  20.  
  21.     return iter
  22. end

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