Dart in なごやまつり

2013/08/25 なごやまつり https://connpass.com/event/2414/

Transcript

1. Dartの型システム
   @zetta1985
   原 知愛
   Dart / Java / JS / DDD / REST
   Google信者
   #SugoiH_c0hama #nagoya.dart
   2013/08/25 なごやまつり
   

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2. Dart Runtime
   Dart Code
   Dart VM
   Snapshot
   dart2js
   JavaScript
   V8 etc...
   

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3. Isolates
   Isolate
   Receive
   Port
   Isolate
   Receive
   Port
   Send
   Port
   Send
   Port
   Snap
   shot
   Snap
   shot
   

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4. Development Tools
   Dart Editor
   Dartium
   (Browser)
   Dart SDK
   Dart VM dart2js
   dart
   analyzer
   dartdoc
   Pub
   (Package
   Manager)
   Eclipse
   Plugin
   IntellJ IDEA
   Plugin
   

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5. Language Spec
   基本はゆるふわなJava
   ● 言語設計者はGilad Bracha氏
   ○ Java言語仕様
   ○ JavaVM仕様
   ○ Pluggable (Optional) Type System提唱
   ● 他、Jochua J. Bloch氏（Effective Javaの人）も
   

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6. Language Spec
   ● Optional Parameter
   ● Named Parameter
   ● Method Cascading
   ● Const Variable
   ● Generics
   ● Named Constructor
   ● Factory Constructor
   ● Library Private
   ● Implicit Interface
   ● Mix-in
   

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7. 動的型付言語（実行環境）
   +
   型検査器（ツール）
   ||
   Optional Typing
   

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8. Java-likeなLL（Dart VM）
   +
   dartanalyzer
   ||
   Dart
   

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9. 良い所
   Future & Stream
   API
   

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10. Future: File IO
    new File("./foo.txt").fullPath()
    .then((fullpath) {
    print("foo.txt's fullpath is $fullpath");
    })
    .catchError((e) {
    print("foo.txt is not exists.");
    });
    

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11. Future: HTTP Request
    new HttpClient().getUrl(url).then((req){
    req.headers.add("contentType", "text/html");
    return req.close();
    }).then((res) {
    res.transform(
    new StringDecoder()).forEach(print);
    });
    

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12. Stream: Standard Input
    print("Please Input A.");
    var lines = stdin
    .transform(new StringDecoder())
    .transform(new LineSplitter());
    lines.listen((str){
    print("Your input's length : ${str.length}");
    print(str == "A" ? "Just A." : "Not A.");
    });
    

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13. Stream: DOM Event
    var stream = query("input#hello").onClick;
    stream.listen((e) {
    window.alert("hello, world.");
    });
    

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14. Stream: HTTP Server
    HttpServer.bind("127.0.0.1", 8080).then((server) {
    server.listen((req) {
    req.response.write("This message from my server.");
    req.response.close();
    });
    });
    

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15. Stream: File Read
    Stream stream = new File('bar.txt').openRead();
    StreamSubscription> subscription;
    subscription = stream.listen((bytes) {
    for (var b in bytes) {
    print(new String.fromCharCode(b));
    if (b == '#'.codeUnitAt(0)) {
    subscription.cancel();
    return;
    }
    }
    });
    

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16. DartとGoogle
    ● Dartの一番のUserは、Google自身
    ● SPDYのような普及方法を目指す？
    ● GoogleはWebエンジニアと共に、
    　Web開発の未来を作りたい。
    ● JavaScriptを駆逐するわけではない
    

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17. Dartのこれから
    ● dartanalyzerをもっと進化させたい
    　（個人的に）
    ● Chromeにさえ乗っかれば・・・
    ● Google App Engine対応が気になる
    ● Android対応すればワンチャンあるで
    

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18. Thanks
    

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