Ask HN: How to teach a 4 year old to code?

Have you had any experience teaching a 4 year old how to code? I'm thinking about not just typing but the mindset of automation and programming. My son is in a weekly class called Kiddie Coders and they are learning directions and how to put arrows together on a sheet of paper to get someone through a series of squares.

I was thinking of putting together activities at home so he can see how to tell instructions to someone who is blind, or follow instructions like a recipe (the favorite analogy to coding seems to be cooking)