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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

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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。