Comment by CharlieDigital

I don't know if I'd consider that the reactive callback because there's no change in state if I only put the `console.log` in `onChange`. The point of the reactive callback is to be invoked on a change in state and in this case, that is the component function would you agree?

In Vue, for example, when I set up a `watch`, the change in state only invokes the callback that is wired to the state. In React, the entire component function is invoked again on a change of state.