Comparing with Java or popular languages like those at the top of tiobe?
Lambdas, First class functions, and closures are a great feature missing in basically every other popular language (things like Javas lambdas or function pointers aren't even close in real world use).
Proper tail calls is another feature missing from that list and despite some browsers refusing to honor the spec they ratified, it's still implemented in Safari/javascriptCore, XS6, duktape, node 6-7, etc.
The interplay between js dynamic objects and closures is difficult to describe, but a thing of beauty when fully understood. Object literals are also basically unique to js on that list as well.
There's a lot to love about most languages and JS is no exception.
