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| extension Array { | |
| func scanl<T>(initial: T, combine:@noescape (Element, T) -> T) -> [T] { | |
| guard let first = self.first else { return [initial] } | |
| return [initial] + Array(self.dropFirst()).scanl(initial: combine(first, initial), combine: combine) | |
| } | |
| } |
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