Pure functional only takes you so far. If you’re using transient servers to process http queries that has no local state, then the frp abstractions are probably

Pure functional only takes you so far. If you’re using transient servers to process http queries that has no local state, then the frp abstractions are probably a good fit. When you’re dealing with an app or a single page web app, you’re spending the whole user session mutating one big state (represented on the UI). Every events are going to apply some diff over that big state, and so what you have in practice is a stream of effects.