> init(keysAndValues:Dictionary<String, String>) {
> self.keys.append(contentsOf: keysAndValues.keys)
> }
>
> Above code doesn't call `didSet` in playground. My .swift file is similar and
> didn't call `didSet` either. However, if without a struct, `didSet` is called.
“If you don’t need to compute the property but still need to provide code that
is run before and after setting a new value, use willSet and didSet. The code
you provide is run any time the value changes outside of an initializer.”
Excerpt From: Apple Inc. “The Swift Programming Language (Swift 3.1).” iBooks.
https://itun.es/us/jEUH0.l
Note “outside of an initializer”. didSet and willSet are not called in
initializers.
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