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Extension to Count Unique Elements in Array
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| extension Array where Element: Comparable { | |
| var uniqueElements: Int { | |
| let sorted = self.sorted(by: <) | |
| let initial: (Element?, Int) = (.none, 0) | |
| let counter = sorted.reduce(initial) { ($1, $0.0 == $1 ? $0.1 : $0.1 + 1) } | |
| return counter.1 | |
| } | |
| } |
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