Ensuring a Random Number is not Re-picked

I streamlined my JS for you with a slightly more elegant solution that only uses 3 variables.

WHAT YOU NEED:

1. A variable to store a single text array formatted like this: 1,2,3,4,5,6,7,8,9,10,11.... through your top number. Separate values with a comma only; NOT a comma + space. In my example, the variable is named Text_Array and goes from 1 to 100.
2. A variable to receive your Random Number. This can be either a text or numeric variable depending on what you want to do with it. In my example, it is a text variable named Random.  My example doesn't do anything other than display the random number chosen, but obviously you would want to evaluate the value and then do something based on it like go to layer, play media, jump to slide, etc.
3. A variable to track how many items are left in your list. You will use this to track when you have used all of the numbers to do something different.
4. Something to trigger your JavaScript. I'm using a button.  Here is the JavaScript code commented out so you can see what it is doing:
   

   
   //get the StoryLine player
   var player=GetPlayer();

   //get Storyline variable value as a string
   var textArray=player.GetVar("Text_Array");

   //Convert string to a numeric array
   numArray=textArray.split(",").map(Number);

   //Get a random number from the array and send it to StoryLine
   var randNum = numArray[Math.floor(Math.random() * numArray.length)];
   player.SetVar("Random",randNum);

   //Remove the random number from your array and get the array's length
   numArray.splice(numArray.indexOf(randNum), 1);
   var itemsLeft=numArray.length;

   //Convert array to a string and send it back to SL along with the array's length
   textArray=numArray.map(String).toString();
   player.SetVar("Items_Left", itemsLeft);
   player.SetVar("Text_Array", textArray);

See it in action here

Example is SL360
Attached file is SL2