Hi,
I’d suggest benchmarking different methods until you find one that works. You can use Benchee for that.
You might like to avoid putting the entire function on one long line. If you give things names and keep each line relatively short it is easier to read.
Did you by chance read the documentation for Stream? At the top or explains how to swap from Enum to Stream.
Source of this code: How to generate permutations from different sets of elements? - #12 by Eiji
