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45 lines
834 B
Swift
45 lines
834 B
Swift
// https://github.com/apple/swift/blob/main/CHANGELOG.md#swift-58
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@available(macOS 12, *)
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public struct Temperature {
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public var degreesCelsius: Double
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// ...
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}
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extension Temperature {
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@available(macOS 12, *)
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@backDeployed(before: macOS 13)
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public var degreesFahrenheit: Double {
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return (degreesCelsius * 9 / 5) + 32
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}
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}
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func collectionDowncast(_ arr: [Any]) {
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switch arr {
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case let ints as [Int]:
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0
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case is [Bool]:
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1
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case _:
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2
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}
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}
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struct Button {
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var tapHandler: (() -> ())?
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}
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class ViewController {
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var button: Button = Button()
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func setup() {
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button.tapHandler = { [weak self] in
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guard let self else { return }
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dismiss() // refers to `self.dismiss()`
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}
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}
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func dismiss() {}
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}
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