The introduction of complex data types: Arrays, Sets, and Tuples. I normally get sets and tuples mixed up hopefully not after today. I spent some time going through my older run throughs of the material.
In a previous attempt to make it through the 100 days, I had created an Xcode playground with pages for the different days.

I’ll brush this bad boy off and use it to take notes. One of the gripes that I have that waiting for results feels kind of nerve wracking as I’m looking at the little spinner in the corner of the status bar.
I liked using playgrounds sometimes to see if certain lines are valid.

Apparently, you can’t use raw values with associated types in enums.
This one took a while, but I think this time was just a little more fun to do.
