Sectiontalks about the merge operation in processing FRP streams ( Sodium Library ). The book shows the flow pooling scheme below and says that when an event enters FRP logic through a stream, it causes a cascade of state changes that occur in a transactional context, so all changes are atomic.
Event streams - sDeselect, sSelect(see 2 events: "+" and "-") come from user interface controls, since they occur within the same FRP transaction, their transferred events are considered simultaneous. Then the book says
merge , , . : , ; .
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