Getting an LED to blink 10 random numbers

Thanks so much for your help. No joke I have probably logged 10 hours into trying to solve this problem on my own, learning the hard way that setIntevals with the same name execute concurrently from a loop instead of sequentially and that one clearInterval blows the whole thing up. Definitely not an efficient use of time but I learned a lot.

One thing with your last example though is that I want to retain the data in memory. If I do a for counter with that code, would I still accomplish the overall goal? (alternatively I could always transfer the data into a new array and then pull/destroy the data from new that array, but that seems inefficient?