Lua 4.0 Unconfirmed variables and conditional statements

print(gogo)
if (gogo == true) then
 print("yes")
elseif (gogo == false) then
 print("no")
end

print(true) - prints "nil"

This code confuses me.

print(gogo)
if (gogo == true) then
 print("yes")
elseif (gogo == false) then
 print("no")
end

Why does gogo evaluate as true? Shouldn’t it produce an error?

It does not evaluate to true, it cannot, because there is no boolean type in Lua 4.0.

< pre>print(true) – prints “nil”

By default, undefined global variables are zero, so gogo == true. They are all zero.