Update the cell value in Observablehq reactive environment

Question

When code in the cell tries to update the value of another cell Observablehq Runtime can't see this event.

The simple example on Observablehq: https://beta.observablehq.com/@sen77/updating-a-cell-from-another-cell

Answer 1

Sure thing, here's a solution that uses mutable state:

https://beta.observablehq.com/d/e57c4f7c734d7b39

Observable aims to be a functional-programming flavored reactive environment, so mutable values like this one aren't handled automatically: methods like [].push() are not easily tracked.