Coffee Compilation

HelloCoffeeTest.coffee

# Copyright (c) 2011, the <your_company> project authors. Please don't see the
# AUTHORS file for details. All rights reserved. Use of this source code is
# governed by a BSD-style license that can be found in the LICENSE file.
# Simple test program invoked with an option to eagerly
# compile all code that is loaded in the isolate.
# VMOptions=--fuu_dart

class HelloCoffeeTest
    test_main: ->
        console.log "Hello, Coffee man!"

new HelloCoffeeTest().test_main()

HelloCoffeeTest.coffee.js

(function() {
  var HelloCoffeeTest;
  HelloCoffeeTest = (function() {
    function HelloCoffeeTest() {}
    HelloCoffeeTest.prototype.test_main = function() {
      return console.log("Hello, Coffee man!");
    };
    return HelloCoffeeTest;
  })();
  new HelloCoffeeTest().test_main();
}).call(this);

That's the CoffeeScript compiler doing it, and .call() is actually undefined behavior in Javascript; normally the browser will do what you're stating, but if you "use strict";, it actually does .call(undefined) and then promptly dies.

That's why.

He isn't, that code is what gets generated from the CoffeeScript above.

He could call (function(){...})(); instead but in that case "this" inside of (function(){}) will belong to global object. however, in this case it belongs to parent scope.

Guys that code is generated. If anything is worth discussing it is why the coffeescript compiler does that...