JavaScript vs. CoffeeScript vs. IcedCoffeeScript

01_auth.js

// JavaScript

auth: function(username, password, callback) {
  var self = this;
  var hash = this._encodePassword(password);
  this.model.find({name: username, encoded_password: hash}, function(err, docs) {
    if (docs.length == 0) return callback(false);
    var user = docs[0];
    self._generateToken(user, function(token) {
      callback(user, token);
    });
  });
}

02_auth.coffee

// CoffeeScript

auth: (username, password, callback) ->
  hash = @_encodePassword(password)
  @model.find {name: username, encoded_password: hash}, (err, docs) =>
    return callback(false) if docs.length == 0
    user = docs[0]
    @_generateToken user, (token) ->
      callback(user, token)

03_auth_iced.coffee

// IcedCoffeeScript

auth: (username, password, callback) ->
  hash = @_encodePassword(password)
  await @model.find {name: username, encoded_password: hash}, defer err, docs
  return callback(false) if docs.length == 0
  user = docs[0]
  await @_generateToken user, defer token
  callback(user, token)