Ciro Santilli @cirosantilli 40

React function component version of react/ref-click-counter.html using useRef.

Minimal React hello world example. As you click:By opening a web inspector, you can see that only modified elements get updated. So we understand that JSX parses its "HTML-like" into a tree, and then propagates updates on that tree.

By looking at the terminal, we see that render() does get called every time the button is clicked, so the tree of elements does get recreated every time. But then React diffes thing out and only updates things in the DOM where needed.

This is apparently where past exam papers can be found. Paywalled of course.

The paywall is stupid however, as they seem to provide past papers upon request, e.g.

This adds to the mess of having a different location for material per department. Presumably this exists because the central university authority wants to centralize examinations to have better control over degree requirements. If only they would also do the same for all materials and end the mess.

Pauli matrix.