You're totally right (although they're technically not called parameters). The if statement will run if (and only if) its condition is true.
Obejcts, numbers, and strings are considered true. nil is considered false.
We can use keywords like or and and to manipulate this behavior a bit.
if true or false then
If you read this in English, it should make sense. This if statement will run its code if true is true, OR if false is true. Since true is true, it will run.
if true and false then
Again, this makes sense if you read it in English. This if statement will run its code if true is true, AND if false is true. Since false isn't true, it won't run.
Both these words can be mixed up, but this can be a bit confusing. and has a higher precedence than or. Personally, I think it's safest and cleanest to use parentheses for the correct order.
if false or (false and true) then
This code will run in two possible situations (because we used or). It will run if false is true, OR if false and true are both true. Since neither of these situations work, it won't run.
Both keywords will "short-circuit", that is, the second or finds a single true condition, no other condition will be checked.
if print(5) or true then
if true or print(5) then
Both these statements will run, but only the first condition will be checked. Run these for yourself and look at the output.
and works the same way, except it will stop running at the first value that equals false. This lets us do things like
if humanoid and humanoid.Health > 0 then
without fearing an error, because if the humanoid doesn't exist its health will never be checked.
Comment with questions!
