This demo is fairly similar to the previous demos I showed in this other article. This one was just for fun, after I noticed the behavior of the Google page showing various stocks and indexes - for example:

Specifically, I’m referring to the 23,517.78 value, which updates every 10 seconds or so:

My version does not precisely replicate this widget’s behavior - but it comes close.

My runnable demo.

My source code.

There are two versions in GitHub: synchronous and asynchronous. The asynchronous version uses the same approach as described in my split-flap display board demo.

As with my last two posts, the idea was for me to learn some of the basics, by building the simplest thing that actually worked well enough for my personal satisfaction.