[SOLVED] Program doesn't work on first try, but second

menu[menustate].draw()

menustate = "Home"

menu = {
  ["Home"] = {
	options = {"Start", "Options", "Quit"},
	draw = drawMain
  },
  ["Start"] = {
	options = {"Go!", "Options", "Home", "SHelp"},
	draw = drawStart
  },
  ["Options"] = {
	options = {"Start", "Home", "Help"},
	draw = drawOptions
  },
}

draw = drawMain

What leads me to this theory is that everytime I change the code (in my external text editor) I have to reboot the turtle to make the code work. I remember that I simply had to restart the program when I programmed half a year ago.

supernicejohn, on 01 March 2017 - 11:04 PM said:

(Contemplating on wether or not to answer this one too, but hey first to the mill is the first to grind your corn, and I tend to be early, and "I really hope somebody can help me with this, I'm despairing." makes me think you'd like a quick reply.)
When I read the title I wondered if the problem included global variables, and looking at the code, it does:

draw = drawMain

might seem all well and good, but the fact is that 'drawMain' is in fact nil when that assignment is made.
As to why it works the second time, and why I figured it'd involve global variables is because further down the code, drawMain is defined, and when run a second time the program will actually assign 'draw' as the global variable 'drawMain' left by the last run of the program.
It'll do that because 'drawMain' will be defined, because doing "varName = nil" isn't wrong in itself, rather calling a non-existent function is wrong, and gives precisely the aforementioned error.

One trick to fix this would be to add "local myFunction, mySecondFunction" to the start of the program, and then it will know to call (what ever is assigned to for example 'myFunction') at the time of running the parent function, since it will know where to "look" for a function.
Also using local variables is a good habit, for one it eliminates these problems, and it doesn't clutter _G as global variables do. :)/>

What leads me to this theory is that everytime I change the code (in my external text editor) I have to reboot the turtle to make the code work. I remember that I simply had to restart the program when I programmed half a year ago.

That's odd, but it might be related to the global variable problem. Try running the program twice after editing it :P/>

1. Moving my drawMain() function (and all the other draw functions) to the top
2. Setting all variables to local

Lupus590, on 02 March 2017 - 06:13 PM said:

have you looked at this? http://lua-users.org...i/ScopeTutorial

--# won't work as otherLoop isn't defined yet
local function badLoop()
  otherLoop()
end
local function otherLoop()
  badLoop()
end

--# predefining otherLoop fixes the issue
local badLoop --# not even assigning anything, just say it exists or will exist
local function badLoop()
  otherLoop()
end
function otherLoop() --# we already said that it's local, bad things happen if we say it again - this could also be your problem with local
  badLoop()
end

Lupus590, on 02 March 2017 - 08:09 PM said:

You could try predefining the things which break

--# won't work as otherLoop isn't defined yet
local function badLoop()
  otherLoop()
end
local function otherLoop()
  badLoop()
end

--# predefining otherLoop fixes the issue
local badLoop --# not even assigning anything, just say it exists or will exist
local function badLoop()
  otherLoop()
end
function otherLoop() --# we already said that it's local, bad things happen if we say it again - this could also be your problem with local
  badLoop()
end