How does "and not" work for a bool value?

For example

	local ran = false

	for i, v in pairs(game.Workspace.Model1:GetChildren()) do
	    local intValue = v:FindFirstChild("DataValuel")

	        if intValue.Value == 0 and not ran then

	            ----do a thing

	            ran = true;

	        end

	        --// do other things

	    end

	end

What does Lua and not ran interpret as? I do not understand. ran is set to false, so and not ran would mean and not ran = false?

For a Lua conditional statement to be truthy, the condition must evaluate to a value that is not false nor nil. The not keyword returns the boolean complement of the value that it precedes; if the value is truthy, then preceding the value with not will return false because the complement of a truthy value is a non-truthy value, or false. If the not keyword precedes a non-truthy value (false or nil), then true will be returned because it is the only truthy boolean value that exists in Lua. Note that the not keyword will always return a boolean.

not ran is interpreted the same way. Since ran refers to false, preceding it with not will return true. If ran were to refer to true, then the condition would evaluate to false because not true is equivalent to false.

So, the conditional statement in question (if intValue.Value == 0 and not ran then) will only have its body ran if those two statements evaluate to true because you're using the and keyword. Think of reading it as "if the Value property of intValue is equal to 0 and the complement of ran is equal to true then..."

Hey Seyfert,

The method 'not' works as the opposite of what you want. So, when you check if a bool value is not what it is right now, it means that it is check for the opposite of that value. So, if you check if true is not true, then you are checking if it's false. I most of the time use not to check if a UserData Value exists or not. Which returns a boolean value. Here is where you can find out more about the not method and below is just a personal example.

####Example A

-- Using Boolean variables inside the script --
local bool = true

if not bool then
	print("It's false.")
	bool = true;
else
	print("It's true")
	bool = false;
end
--[[
 The above works like a toggle. When the bool value is true, it will run the second line of code and when it's false it will run the first line of code. 
--]]

####Example B

-- Using Booleans to check if the UserDataValues exist --

local part = workspace:FindFirstChild("Part")

if not part then
	print("The part doesn't exist.")
end
--[[ 
 The above will check if the part exists and if it doesn't then it will print "The part doesn't exist."
--]]

##Well, I hope I helped in one way or another. Have a great day/night.

~~ KingLoneCat