[MontyCarloHall]

For programming, no. Any programming question I’ve had in the last 15 years has been answered with a Google search, and any new language/technology I’ve picked up has been learned from online articles. Any programming books I still have are language reference manuals, which I keep purely for nostalgia. These too are all online these days.

For math/algorithms, yes. There are still many topics that do not have good online articles but are covered at length in textbooks. These topics are usually covered in journal articles too, but at a much more terse level than a textbook chapter.

[tjr]

Generally my answer also, but I do still sometimes buy programming books, as sometimes I find the online documentation inadequate for me to understand something.

One example: probably contrary to a lot of people on HN, I haven't done a whole lot of web programming, and a few years ago got involved in a project that touched on Angular, Node, VueJS, etc. I found reading (parts of) a few real books to be helpful in getting up to speed in general understanding, but now am back to just using web resources.