The title is „JavaScript for Data Science“, not „Data Science for JavaScript“. It’s like... in a bar: they will serve a beer for you, so they have the beer and you have you. For a book called „JS for DS“, you should have the the DS while they bring the JS.

Compare this with: „Data wrangling with JavaScript“ [1]

[1] https://www.amazon.de/Data-Wrangling-JavaScript-Ashley-Davis...