ClojureでJavascriptが書けるClojureScriptが発表されました。(via Clojure/core — Introducing ClojureScript)
と思いかけましたが要はCoffeeScriptと同じアプローチで、
「オブジェクト指向なCoffeeScriptの代わりに関数型言語のClojure(ClojureScript)でJavascript書けるよ」
ということのようです。
とはいえClojureScriptはClojureの完全なJS実装というわけじゃなくて、JVMやJavaコアライブラリに依存してるところも多いので、Pure Clojureなら大体動く予定という感じのようです。
JavascriptとなるとGoogle Closureと名前が紛らわしいわ！という問題は承知してるそうですが、ClojureScript自体がGoogle Closure(Library, Compiler)に依存してるのでややこしいです。
インストール
% git clone git://github.com/clojure/clojurescript.git
% cd clojurescript
% script/bootstrap
ClojureScriptはClojureとJavascriptで書かれてるのでJava 6が必要です。（JavascriptにはRhinoがある）
REPL
% script/repljs
#'user/jse
"Type: " :cljs/quit " to quit"
ClojureScript:cljs.user> (println "foo")
foo
nil
Javascriptへのコンパイル
;; hello.cljs
(ns hello)
(defn ^:export greet [n]
(str "Hello " n))
% bin/cljsc hello.cljs '{:optimizations :advanced}' > hello.js
;; hello.js
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Webでの実行
<html>
<head></head>
<body>
<script type="text/javascript" src="hello.js"></script>
<script>
alert(hello.greet("ClojureScript"))
</script>
</body>
</html>
感想
お、動くじゃん。
ただ、CoffeeScriptの利点は吐かれるJSもかなり可読性が高いものになる（それこそ俺が適当に手書きしたJSより）というところだと思うので、元々関数型で結構書きやすいJSを関数型言語からイミフなJSにコンパイルするのはちょっとなーという感じです。モジュール性を高めたい場合にはunderscore.js等を使ってJSネイティブで関数型っぽく書く方が僕は惹かれています。
ClojureScriptをnodejsで動かすって部分は更にイミフです。サーバーサイドだったらClojureそのもので書いたらえんちゃうの？
JavascriptはWebのアセンブラだ！っていう考えは今後主流になったりするんでしょうかね。どうなんでしょうかね。
