In this tutorial, we take Fisher-Yates old idea and apply it to Verse code. We create an elegant and simple random array that does not draw duplicates. First step is to create an ordered array of integers. Second step is to shuffle or randomize those values. And third, you simply increment through that array to draw elements from the array you are wanting random elements from.
https://dev.epicgames.com/community/learning/tutorials/qEaO/fortnite-the-most-elegant-random-array-in-verse-code-no-duplicates