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Default enum associated values
Basics article available: EnumsNew in Swift 5.1: Enum cases can now specify defaults for their associated values — which comes very much in handy when we want to add options or overrides to a given enum case.
// Associated enum value defaults are specified the same way as
// default function arguments:
enum Content {
case text(String)
case image(Image, description: String? = nil)
case video(Video, autoplay: Bool = false)
}
// At the call site, any associated value that has a default
// can be omitted, and the default will be used:
let video = Content.video(Video(url: url))
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