Now we are getting to the main algorithm.
To shuffle an array a of n elements (indices 0..n-1):
for i from n − 1 downto 1 do
j ← random integer with 0 ≤ j ≤ i
exchange a[j] and a
Add 2 more variables to use in algorithm. I used "k" instead of "j" to see more clearly. And to exchange values of two array values we need a temporary variable.
For loop does not support decreasing values, instead of it i used a while loop. Add a new "system-while" event.
Add another condition for stopping "while"
. If loop reaches to 1, it will stop.
We have a condition, but our loop is a infinite loop at now. Because "i" value is still the same. We have to decrease it, at the end. But first we will pick a random value with k to exchange. Add a "System-set value" action
UPDATE: There is an error in picture random(i+1) can give a value like i,999999 so using a function like int(floor(random(i+1))) is better idea