coffeescript class, instance (variables/methods) and this context issues.

gistfile1.coffee

class Animal
    @classVar = 'class var'
    
    constructor: (@options) ->
        @memberVar = 'the member'
        
    _privateMethod: (param) ->
        console.log('private instance method ' + param)
        
    instanceMethod: ->
        @_privateMethod(@options)
        
    @classMethod: ->
        console.log('class method, accessing ' + @classVar)
        
        
a = new Animal(opt1: 'aha')
a.instanceMethod()
Animal.classMethod()
# a.classMethod() not possible in coffeescript
console.log(Animal.classVar)
console.log(a.memberVar)


a2 = new Animal()
Animal.classVar = 'classVar2'
Animal.classMethod()
a2.memberVar = 'memberVar2'
console.log(a2.memberVar)
console.log(a.memberVar)



## COMPILED JAVASCRIPT

var Animal, a, a2;

Animal = (function() {

  Animal.name = 'Animal';
  Animal.classVar = 'class var';

  function Animal(options) {
    this.options = options;
    this.memberVar = 'the member';
  }

  Animal.prototype._privateMethod = function(param) {
    return console.log('private instance method ' + param);
  };

  Animal.prototype.instanceMethod = function() {
    return this._privateMethod(this.options);
  };

  Animal.classMethod = function() {
    return console.log('class method, accessing ' + this.classVar);
  };

  return Animal;

})();

a = new Animal({
  opt1: 'aha'
});

a.instanceMethod();
Animal.classMethod();
console.log(Animal.classVar);
console.log(a.memberVar);

a2 = new Animal();
Animal.classVar = 'classVar2';
Animal.classMethod();
a2.memberVar = 'memberVar2';
console.log(a2.memberVar);
console.log(a.memberVar);



## CONSOLE OUTPUT

private instance method [object Object]
class method, accessing class var
class var
the member
class method, accessing classVar2
memberVar2
the member