Mike Bostock

Gallery

I'm seeing "Uncaught (in promise) undefined" errors for the transition.end() line in the console.

Fabian Iwand

That will happen if the transition is interrupted, e.g. by clicking the replay button or running a cell.

https://github.com/d3/d3-transition#transition_end

I could squelch that error here, but I don’t see any particular need to given that most readers won’t see the console.