Learning to program is getting harder (2018)

The article proposes various ways to mitigate the problem of Learning to Program Getting Harder. One approach is "Interactive tutorials that run code in a browser,..."

I've seen this approach implemented for teaching logic and proof, both

https://www.ma.imperial.ac.uk/~buzzard/xena/natural_number_g...

and

http://incredible.pm/

and it seems to work well. It is certainly easy to get started.