Uh… I’m unsure that is accurate…
Scala, as much as I like the language (my favorate of the JVM languages), it is dying, mostly to Kotlin.
Swift, isn’t that the weird Mac-specific thing that no one outside of macs use? Who’d want that?
Javascript, sadly, should probably be higher, it is the most popular language in the world… >.>
Etc…
This seems very book-selling specific, which considering the source makes sense. 
But unsure of the accuracy of actual learning, especially with Scala there, Scala’s been dying for a few years now (since java8 absorbed some of Scala’s features) and it never got very big to begin with…
