Reactive programs don't have to be declarative. You can express a reactive program imperatively. The defining feature of a reactive program is that relationshi

Reactive programs don't have to be declarative. You can express a reactive program imperatively. The defining feature of a reactive program is that relationships between inputs and outputs are automatically tracked, and changing an input will automatically update the dependent outputs. Facebook had a whole experimental language (now abandoned) for writing reactive programs with imperative code: http://skiplang.com/ http://skiplang.com/