Thanks to Laszlo Török, ClojureScript now has PersistentVectors,
https://github.com/clojure/clojurescript/commit/e615f4cd326e7c608050272c64c4dfaff9a34689
.
They are based on the Java implementations found in Clojure. I'm happy to
say they thoroughly trounce the old copy-on-write Vectors:
This is excellent. Big thanks to Laszlo! I've been working on
a Raphaël-based interactive GUI app in ClojureScript that maintains a big
vector of elements, and had just recently started to run into what seemed
to be the performance limits of the copy-on-write approach. I'm very
optimistic
It has been a great learning experience on both Clojure internals and the
Clojurescript side.
One thing to note, that the handwritten JS (which also a straight port of
the java version and not optimized by the closure compiler) still
outperforms the Clojurescript version consistently by at least a
