100 Days of Swift

Day 3

2026-04-20

Since yesterday I did Days 1, 2, and 3 by accident, I’m going ahead and redoing Day 3 today.

Constants and variables, simple data types — I’m good with those. I got 100% on the quizzes 🤓

Now, however, it’s getting a little more complicated.

• Array — I like that you can define them with [data type] because that reinforces for me how you know you have an array
• Dictionary — an array (you can tell because of [ ]) of key:value pairs.
• Set — an array with some special functionality (fast search, primarily)
• Enum — arbitrary fixed list that only knows what it’s been told

Is someone going to come along and say that I’m thinking about it all wrong?

Quizzes:

1. Dictionaries — 5/6 — my first missed question! I didn’t see the () instead of the []
2. Dictionary default values — 8/12 — syntax syntax syntax
3. Sets — 12/12 — reading carefully is essential
4. Enums — 5/6 — some things are better as an array