Programming in Swift: Functions & Types

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Before I wrap up this course, I want to touch on a few lingering questions you might have about all of these named types.

Value vs. Reference

[Slide 01] A common big question is whether to use a structure or a class. This might also be phrased like “Should I use a value type or a reference type?”.

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Extensibility

Sometimes you don’t actually have a choice. If you’re extending the behavior of code you don’t own, you may have to subclass. In that button example, it’s possible Button is part of a framework you’re using, and there’s no way you can modify or extend the source code to fit your needs.

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