Having tried for a long time for a viable option to practice programming in my phone while commuting (not seating, seldom having both hands available) I'd say t

Having tried for a long time for a viable option to practice programming in my phone while commuting (not seating, seldom having both hands available) I'd say that visual programming is not that useful in that medium, at least if it's Scratch-like. Maybe a language with better abstractions would be more useful. I tried a Scratch-like for android and did the first couple of days of Advent of Code a couple years ago. It was tyring (too many instructions to drag), midly infuriating (when something didn't fall where it should), hard to refactor (when experimenting). That's why that year I ended up transitioning to lisp, writing in a text editor and copying to a web-based lisp interpreter. The local maxima I found was this last year with J's android client. With their terseness array languages can be used quite effectively with mobile constrains.