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9.1 Shiny JavaScript sources: I would want to see a image of the Github project page to complement the first paragraph. It is hard to understand the folder structure you are talking about in the paragraph.
Figures 9.1, 9.2, and on: Somewhat hard to read the text. Can you make the image zoomable? That way, readers can click on the image and see an enlarged view.
Figure 9.3: I downloaded VS code from scratch and tried to run the code. However, I couldn't find the "run arrow" as seen in the Figure. I don't think the "run arrow" is there by default? Maybe if you could include a section on how to run code on VS Code, that'd be helpful for beginners.
The sentence below 9.4.4.2 Strings ("Below are the main methods related to the String object (character in R).") is vague. What do you mean inside the parenthesis?