In this series, I will explore programming techniques for the notebook platform Observable. Today I am looking at how to direct a reactive Dataflow stream to one-of-n downstream cells. This article assumes you are familiar with Observable's non-linear reactive program flow already.
Sometimes we want control the dataflow with logic. If we have a cell called data streaming values, we might like to direct those updates to either cell_1 or cell_2.
You can programatically trigger dataflow by calling dispatchEvent on its enclosing view.
You can create a lightweight view with
Now dataflow is guided by the value of the choice variable.
Give it a try on the live notebook at @tomlarkworthy/switch-dataflow
I hope you find that useful and that you find other useful ways to manipulate dataflow!