Re: table.remove not shifting keys when Lua file is in bytecode format
- From: Egor Skriptunoff <egor.skriptunoff@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Tue, 25 May 2021 04:37:23 +0300
On Fri, May 21, 2021 at 5:19 PM Demi Marie Obenour wrote:
table.remove() calculates the length of the table to determine
how much to move.
Avoid nil in arrays.
Would it be possible to issue a warning when this happens?
You can redefine table.remove() and some other functions to raise an
exception if there is a nil inside.
function must_have_no_nils_inside(t)
local len, ctr, outside = #t, 0
for k in pairs(t) do
if type(k) == "number" and k > 0 and k % 1 == 0 then
ctr, outside = ctr + 1, outside or k > len
end
end
if outside or ctr ~= len then
error("Array contains nil inside", 3)
end
end
function table.check_and_remove(t, ...)
must_have_no_nils_inside(t)
return table.remove(t, ...)
end
local x = {11, 22}
table.check_and_remove(x) -- ok
x = {nil, 22}
table.check_and_remove(x) -- error
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