0. read as English + Xcode/Playgrounds IDE
1. enum + optional
2. value type + copy on write
3. function as Type + closure + high order function
4. generics (Type or function) + protocol
5. protocol + extension
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save, simple: 0, 1, 2
functional programming: 2, 3, (4, 5)
protocol-oriented programming: 2, 4, 5
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