liveranga

Having J on the phone in your pocket is great.

And lots of the "labs" (interactive tutorials) are built in too: 3 dots -> Help -> Labs..

Edit: I should also have mentioned that Termux on android can build ngn-k, goal and a bunch of other open source array languages too.

There's also Rob Pike's Ivy language for Android too.

Just to throw a positive word out there from one of the quiet majority of your readers, I think you absolutely nailed it with Crafting Interpreters.

It's by far the best introductory book on this topic I've come across yet. It's a fun read and completely demystifies the "magic" of how interpreters work.

Thank you for articulating this so well. I've also had a zero-tolerance ad policy for years now. My partner and I refer to ads as Brain-Pollution.