Toribash-Tutorial-Inserts-Loops.md

While

A while loop will keep going round and round until it's condition is met. Conditions are explained in the "Conditional Statements" section of the main tutorial.

Here is an example of a while loop:

x = 1
while(x < 20) do
    x = x * 2
    echo("X: " .. x)
end

What this loop does is keep going while x is less than twenty. So it will echo:

X: 2
X: 4
X: 8
X: 16
X: 32

So why does it echo when X 32? Because it checks if x is less than twenty BEFORE it multiplies it. If we moved the x = x * 2 line under the echo("X: " .. x) line we would get different results:

X: 1
X: 2
X: 4
X: 8
X: 16

Repeat Until

We could also use a repeat until loop.

x = 1
repeat
    x = x * 2
    echo("X: " .. x)
until x >= 20

This is sort of the opposite of a while loop, as it will do the functions until the x is greater than or equal to 20. It will produce the same output as the first while loop.