I’m curious, why do you think they used the name “Behavior” for the BehaviorSuject object in Ractive Extensions?
note: a behavior subject returns the last value (or the init vaue) as the first value to any subscriber.
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In the world of functional reactive programming, a behavior is a value that changes over time. This is exactly what a BehaviorSubject represents: when you subscribe you get the current value, and then you can continue to observe the changes. See http://en.wikipedia.org/wiki/Functional_reactive_programming.