Emanuele Feronato took one of his old Phaser prototypes, the game Mass Attack, and then converted it for Phaser 3 Beta 2. It was fascinating to see how someone would approach creating a game in Phaser 3 Beta given they don't have any documentation to work from yet. The resulting code was basically a 'best guess' approach, although it worked fine.
But I took it and recoded it how I would have approached it, which made for an interesting comparison. You can see the first attempt in this post and then my version in this post.