Coffeescript class instance in callback through classes

Question

When i run this code:

class Dog
    constructor: ()->
        @dog_name = "tulio"
        the_bird = new Bird()
        the_bird.bird_sing(@the_method)
        @say_name()

    the_method: ()->
        @dog_name = "james"

    say_name: ()->
        alert @dog_name


class Bird
    bird_sing: (callback)->
        callback()

the_dog = new Dog()

why the alert is sayng "tulio" instead of "james"? Aparently the callback dont know about this(@) how can i get "james" ?

@dog_name = this.dog_name or the_dog.dog_name. but this isn't bound to the context of Dog. So its not the same variable. — majidarif
– majidarif, Commented Oct 31, 2014 at 1:11

Jed Schneider · Accepted Answer · 2014-10-31 01:12:38Z

2

Because the_method is the callback it needs to be bound to the context of this:

http://jsfiddle.net/uaxrgrom/

the_method: ()=>
    @dog_name = "james"

alternatively it needs to be bound on the call

the_bird.bird_sing => @the_method(args...)

answered Oct 31, 2014 at 1:12

Jed Schneider

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