No multiple choice here. Java & JavaScript among the ones listed. But I'm more of a language-agnostic programmer. Sure, I have my preferences, but most languages do things similarly enough that the language itself isn't a barrier.

Seems like it's a JavaScript era, in which we are living.

I'm skilled in Java (about a decade of professional experience and another of fiddlin') and JavaScript (about two decades of professional experience). I've played with C++ for educational purposes. Ain't touched Python at all.

I think Python and Java are my strongest languages (not just from this list but overall). Not sure which one more.

I'm getting better at Rust though, hopefully I can answer 'Rust!' if this question is asked in a year or so.

define skilled? able to write code that works and being familiar with the concepts? or really specialized

because one means 4 checkboxes and the other zero ;D .... although C++ would be debatable since memory management gets tricky ;D

But I did write programs in all 4 of the languages, with even 'sophisticated' things like multi-threading and buffer communications.

still ... depends on your definition in the end.