How do I unsubscribe a handler in Bacon.js?

Question

I'm learning to use the fantastic Bacon.js library for functional reactive programming. Adding handlers to a property or stream is easy:

handler = function(value){... do something ...}
property.onValue(handler)

Say somewhere down the line I want to cancel this subscription, like this (pseudocode):

property.unsubscribe(handler)

Is there a way to do this with Bacon.js?

Answer 1

Both answers above are correct. Personally, I've never used either solution though. In fact, they mainly exist for internal purposes and for writing custom combinators and integrations.

So instead I recommend combinators like take, takeWhile and takeUntil. In an FRP application, the signal that triggers the need can usually be modeled as an EventStream. In that case you can do

var data, stopper // EventStreams
data.takeUntil(stopper).onValue( .. )