"When you explicitly define callbacks like in the examples, you're tightly coupling the response handlers to their requests, which is a relatively poor implemen

"When you explicitly define callbacks like in the examples, you're tightly coupling the response handlers to their requests, which is a relatively poor implementation and will bite you in the ass later on." I agree, if anything this is an argument about notification vs delegation. Callbacks should be used when you need to delegate a feature, like when an array object needs to call outside its scope to ask for a sorting function. Notifications should be used when the calling object doesn't care who handles the information, like in the case of an asynchronous load, and in a proper notification environment you wouldn't have the spagetti code this blog is illustrating.