[[]] doesn't throw - you cannot use try/catch here. What throws is some Reagent/React machinery, waaaay down the line. You can try using React's error boundaries that are supported by Reagent.

https://github.com/reagent-project/reagent/blob/master/doc/ReactFeatures.md#error-boundaries

You could also use [(throw (ex-msg "BOOM!"))] instead of [[]] if you’re just trying to exercise your try/catch. See also the js/window.onerror property.

I'll try the react error boundary, thanks!

Works like a charm, thanks!