[Phanx]

Also another thing that occurred to me is that either method (ipairs or #) will end up skipping values if you remove values inside the loop... but # has the advantage here (yet again) in that you can do the loop backwards to avoid this.

print("ipairs")
local t = { "apple", "banana", "coconut", "durian" }
for i, v in ipairs(t) do
    print(i, v)
    if i == 2 then
        tremove(t, i)
    end
end

You only get "apple", "banana", and "durian" printed, and the loop doesn't even iterate a 4th time.

print("#")
local t = { "apple", "banana", "coconut", "durian" }
for i = 1, #t do
    local v = t[i]
    print(i, v)
    if i == 2 then
        tremove(t, i)
    end
end

You still only get "apple", "banana", and "durian" but the loop does iterate a 4th time and you get a "nil" print.

print("# reverse")
local t = { "apple", "banana", "coconut", "durian" }
for i = #t, 1, -1 do
    local v = t[i]
    print(i, v)
    if i == 2 then
        tremove(t, i)
    end
end

Now you get all 4 values printed.