Ping-Pong Server Socket-Socket Client implemetation for Dartlang.

ping_pong.dart

import 'dart:io';
import 'dart:async';

main() {
  ServerSocket.bind(InternetAddress.LOOPBACK_IP_V4, 8000).then((s_server) {
    s_server.listen((socket) {
     socket.write('Ping!');
      socket.listen((data){
        print(new String.fromCharCodes(data));
        sleep(new Duration(seconds:1));
        socket.write('Ping!');
      });
    });
  }).then((_) {
    Socket.connect(InternetAddress.LOOPBACK_IP_V4, 8000).then((c_socket) {
      c_socket.listen((data){
        print(new String.fromCharCodes(data));
        sleep(new Duration(seconds:1));
        c_socket.write('Pong!');
      });

    });
  });
}