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| prefix func ~<A>(_ keyPath: KeyPath<A, Bool>) -> (A) -> Bool { | |
| return { $0[keyPath: keyPath] } | |
| } | |
| // only people with empty street in their address | |
| people.filter(~\.address.street.isEmpty) | |
| // the names of the people with empty street | |
| people.filter(~\.address.street.isEmpty).map(~\.name) | |
| // => ["Tom", "Alice", "Bob"] |
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