7 replies to this topic

[OczkoSX]

Hi! I'm doing little spam on foum, sry for that

How can I check if variable isnt nil ?

Here is my code: http://pastebin.com/07szXe0i

I'm saying about Tank() function.
I tried if variable == nil but it doesnt work

The second problem is terminating program
When i am in tank mode ($$tank show) and i terminate program, i cant edit it. It says: edit:60: attempt to call nil
I have to reboot PC then.

EDIT: I need checking var because i saw, when tank is empty, his liquid amount is nil, so table[1].amount is nil and program crashes

Edited by OczkoSX, 01 May 2014 - 10:42 AM.

[CometWolf]

if variable then
  --not nil
else
  --nil
end

AS for your other problem, you're overwriting the global table functions with this line

    table = tank_p.getTankInfo("unknown")

the word table is already in use by the global environment, to store all table functions. Either make it a local definition or change the name of your table variable.

[OczkoSX]

Thank you! Is it possible to do:

if variable then
--nil
end

?

i tried ~variable but it doesnt work

[OczkoSX]

Ok, i've got it, just use not var

[HometownPotato]

Well, if variable then checks if it is not nil and not false. If your variable may be false do: if variable ~= nil then

[Bomb Bloke]

OczkoSX was saying he figured out "if not variable then" does the trick.

[HometownPotato]

That still gives you the same problem, if it's false or nil then it not var will be true

[OczkoSX]

I said I know, just have to use

if not var then