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Alex Rivera
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Let's say I want to implement an event bus using a OO programming language. I could do this (pseudocode): class EventBus listeners = [] public register(listener): listeners.add(listener) public unregister(listener): listeners.remove(listener) public fireEvent(event): for (listener in listeners): listener.on(event) This is actually the the observer pattern, but used for event-driven control flow of an application. How would you implement this pattern using a functional programming language (such as one of the lisp flavors)? I ask this because if one doesn't use objects, one would still need some kind of state to maintain a collection of all the listeners. More over, since the listeners collection changes over time, it would not be possible to create a pure functional solution, right?
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