My students get this in the Christmas lecture: it only takes a minimal change in Kolibri and _all_ input fields have fully styled and animated tooltips via popover and anchor-positioning.

Kolibri goodness (stolen from Groovy): memoize to magically make a function a 1000 times faster **without touching it**:
github.com/WebEngineeri...
(testing the cache hits by spoofing the logs)

Next in Kolibri: memoization.
Example: Collatz Sequence in a functional fashion.
It's fast.
I love how Kolibri allows me to bring my Groovy, Java, and Frege experience to the JS world.
webengineering-fhnw.github.io/Kolibri/src/...

and BTW anchors are type safe

a simple example