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Key Path for Closures
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| prefix operator ^ | |
| prefix func ^<Root, Value>(keyPath: KeyPath<Root, Value>) -> (Root) -> Value { | |
| return { $0[keyPath: keyPath] } | |
| } |
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| let items = ["spoon", "", "fork", "", "spatula"] | |
| let kitchenItems = items.filter(^\.isEmpty) |
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