Every language under the sun has closures and first class function objects now (Even C if you count llvm-specific extensions, and Java if you count one method interfaces as a suitable workaround until version 8).

Also, Javascript's version of prototypal inheritance isn't very good. Name me one thing you can do well with Javascript's inheritance that you can't do well in any other dynamic language with some notion of objects having property dictionaries (Perl, Python, Ruby, Lua, etc.).