Reactive notebooks are closer to the idea you mention than other kinds of notebooks, because global state is reflected in the outputs of each cell. The biggest

Reactive notebooks are closer to the idea you mention than other kinds of notebooks, because global state is reflected in the outputs of each cell. The biggest source of bugs when working in Jupyter for instance is that a variable was re-defined somewhere and it's not easy to see that it is changed when you have a cell somewhere above that has the output `foo = x` when the global state claims that foo = y.