LTSV parser/dumper of dart lang

ltsv.dart

class LTSV {

    static Map parse(String str) {
        var pairs = str.trim().split("\t");
        var ret = {};
        for (var pair in pairs) {
            var chunks = pair.split(":");
            var name = chunks.removeAt(0);
            ret[name] = chunks.join(":");
        }
        return ret;
    }

    static String dump(Map map) {
        var chunks = map.keys.map((k)=>"${k}:${map[k]}");
        return "${chunks.join("\t")}\n";
    }

}

main() {
    var str = "a:1\tb:2\n";
    var parsed = LTSV.parse(str);
    print("parsed[\"a\"]=${parsed["a"]}");
    print("parsed[\"b\"]=${parsed["b"]}");
    print("---dump---");
    print(LTSV.dump(parsed));
}

http://api.dartlang.org/docs/releases/latest/dart_core/Collection.html says there is a join() method but my dart(Dart VM version: 0.2.6.0_15369_chrome-bot (Mon Nov 26 22:37:29 2012)) said there is no such method...

I updated my dart-sdk to version 0.3.4.0_r18115 (Tue Feb 5 05:52:09 2013) and join() worked.
Updated code to use join().

Revision2 supports older version(that doesn't have join()) of dart-sdk

I uploaded this as a pub package!
and created a repo for this: https://github.com/tomotaka/dart-ltsv
maintenance of this code will be done on this new repository!
(I think my activities will not be so active about this repo, but any modifications are welcome.)