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amomchilov/improvement.swift Secret

Created March 21, 2018 17:59
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improvement.swift
extension Array {
func removingDuplicates<T: Hashable>(byKey key: KeyPath<Element, T>) -> [Element] {
var seenKeys = Set<T>()
return self.filter { candidate in seenKeys.insert(candidate[keyPath: key]).inserted }
}
func removingDuplicates<T: Hashable>(byKey deriveKey: (Element) -> T) -> [Element] {
var seenKeys = Set<T>()
return self.filter { candidate in seenKeys.insert(deriveKey(candidate)).inserted }
}
}
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