ECMAScript 6/7 on the JVM with TypeScript and Vert.x

es7verticle.ts

/// <reference path="./vertx-js/vertx.d.ts" />

// arrow functions ********************************************* [1]
vertx.createHttpServer().requestHandler(request => {
  // block-scoped variables (let keyword) ********************** [2]
  let response = request.response();
  response.setChunked(true);

  // default parameter ***************************************** [3]
  function send(msg = "NOOP") {
    response.write(msg);
  }
  send();
  send("\n");

  // rest parameters ******************************************* [4]
  function sendMulti(...messages) {
    messages.forEach(msg => response.write(msg));
  }
  sendMulti("Hello", " ", "World", "\n");

  // spread parameters ***************************************** [5]
  let messages = ["Foo", "Bar", "\n"];
  sendMulti(...messages);

  // for...of loop ********************************************* [6]
  let arr = ["1", "+", "1", "=", "2", "\n"];
  for (let v of arr) {
    send(v);
  }

  // multi-line template strings, string interpolation ********* [7]
  let name = "Elvis";
  send(`${name} lives
`);

  // classes *************************************************** [8]
  class Animal {
    eat() {
      send("Animal is eating\n");
    }
  }

  class Dog extends Animal {
    eat() {
      send("Dog is eating\n");
    }

    walk() {
      send("Dog is walking\n");
    }
  }

  class Bird extends Animal {
    eat() {
      super.eat();
      send("Animal is a bird\n");
    }

    fly() {
      send("Bird is flying\n");
    }
  }

  let dog = new Dog();
  let bird = new Bird();
  dog.eat();
  dog.walk();
  bird.eat();
  bird.fly();

  // exponentiation operator *********************************** [9]
  let i = 5 ** 2;
  send("" + i);
  send("\n");

  response.end();
}).listen(8080);