A comparation between Coffee and JS

Coffee.coffee

class PahoMessage
  constructor: (@message) ->
  value: ->
    "value: #{ @message }"
  topic: ->
    "topic: #{ @message }"


paho_message = PahoMessage.new("un mensaje")
console.log paho_message.value
console.log paho_message.topic

javascript.js

var PahoMessage;

PahoMessage = (function() {
  function PahoMessage(message) {
    this.message = message;
  }

  PahoMessage.prototype.value = function() {
    return "value: " + this.message;
  };

  PahoMessage.prototype.topic = function() {
    return "topic: " + this.message;
  };

  return PahoMessage;

})();

paho_message = PahoMessage["new"]("un mensaje");

console.log(paho_message.value);

console.log(paho_message.topic);