For a similar case in Go, where I wanted a run time variable shape of graph, I was able to do without using an array. That was simply by spawning more goroutin

For a similar case in Go, where I wanted a run time variable shape of graph, I was able to do without using an array. That was simply by spawning more goroutines. So for the rx (mux) side, they all just write in to one shared chan which it then further processed. For the tx (demux) side, it is a bit simpler, but again with just an extra goroutine per tx side. This was in a scenario where multiple clients were performing run-time registration with a mux/demux API based upon the comms needs of those specific clients. There is the Go reflect.Select, however it is awkward, and seems to be discouraged, hence I simply used the pattern above.