Dart and Hack are new languages, not new implementations of an existing language. Pyston seems like a new VM for Python (more comparable to HHVM, PyPy and V8).
By "Dart" and "Hack" I meant the Dart VM and HHVM. What I mean to say is that it's neat to see a renewed emphasis on serious, high-performance language implementations, whether for existing or new languages. For awhile it had seemed that there was just JVM/CLR on one side and a bunch of interpreted languages on the other.
Hack and HHVM are completely separate projects (they're even written in different languages: Hack in OCaml, HHVM in C++). They're both really interesting projects though.
Comments
Dart and Hack are new languages, not new implementations of an existing language. Pyston seems like a new VM for Python (more comparable to HHVM, PyPy and V8).
By "Dart" and "Hack" I meant the Dart VM and HHVM. What I mean to say is that it's neat to see a renewed emphasis on serious, high-performance language implementations, whether for existing or new languages. For awhile it had seemed that there was just JVM/CLR on one side and a bunch of interpreted languages on the other.
Hack and HHVM are completely separate projects (they're even written in different languages: Hack in OCaml, HHVM in C++). They're both really interesting projects though.