What aspects of coding?

Turing Tumble is a marble run puzzle game that’s Turing complete, i.e. in the abstract sense, it can compute anything a computer could. It implements bit flippers, logic gates, and memory using falling marbles and levers. Completely mechanical and very tactile.

For textual programming, check out Hedy, a language designed for the classroom. It stands out vs others like Scratch or Snap because Hedy is gradual. A presentation by its creator

Here: https://fsharpforfunandprofit.com/rop/

A very practical and tangible walkthrough

Yeah, that explanation is missing the critical point of generically applying external functions through flat_map/bind

I think this is a good explanation: https://fsharpforfunandprofit.com/rop/

In the short term, I would:

isVibrating = waveformParameters != null // may have just started
if (isVibrating) {
    waveformParameters.Shape = WaveformShape.Square;
    widget.UpdateWaveformParameters(waveformParameters);
}

In the longer term, unless there’s a good reason not to, I’d nudge the implementation towards having the code read more like:

widget.update(waveformParameters);