Is there a way to pass a ratom to the top component (via render-component)?

there is, but why?

🙂

I see it can be done via (defn top-component [] [sub-component my-ratom]) and wonder whether the top-component is necessary in this case.

But then I'm probably doing something utterly wrong.

@dottedmag something like this?

(defn top-component
   [data-ratom]
  [:p (pr-str @data-ratom)])

; render == render-component
(r/render [top-component my-data-ratom] (.getElementById js/document "root"))

Ah, so render accepts not only a component, but also a vector of component and arguments. Thanks!

consider that it's pretty convenient to have direct access to the ratom, rather than threading it through every component

the only reason I can think of to make it an explicit parameter is unit testing

Or creating several instances of a single app on a page. Which is admittedly rare occasion.

I was just reading tutorial and found out the lack of symmetry intriguing. Now I see the symmetry is not lacking, as the way to pass arguments is the same in r/render and inside the components.