lua tables custom made loops

do -- Local scope for Iter.
-- ReverseIpairs’s iterator; Arr is the “invariant state”,
-- and I is the control variable’s previous value:
local function Iter(I, Arr) --reversed Arguments
if I > 1 then
I = I - 1
return I, Arr[I] -- Violates structured programming
-- (not a severe misdeed in such a small function).
end
end
-- An iterator factory -- like ipairs, but goes through
-- the array in reverse order:
function ReverseIpairs(Arr)
return Iter, Arr, #Arr + 1
end
end
for I, Str in ReverseIpairs({“one”, “two”, “three”}) do
print(I, Str)
end