forked from shadowfacts/Tusker
39 lines
853 B
Swift
39 lines
853 B
Swift
//
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// Array+Uniques.swift
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// Tusker
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//
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// Created by Shadowfacts on 1/6/19.
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// Copyright © 2019 Shadowfacts. All rights reserved.
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//
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import Foundation
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extension Array {
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func uniques<ID: Hashable>(by identify: (Element) -> ID) -> [Element] {
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var uniques = Set<Hashed<Element, ID>>()
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for elem in self {
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uniques.insert(Hashed(element: elem, id: identify(elem)))
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}
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return uniques.map(\.element)
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}
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}
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extension Array where Element: Hashable {
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func uniques() -> [Element] {
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return uniques(by: { $0 })
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}
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}
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fileprivate struct Hashed<Element, ID: Hashable>: Hashable {
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let element: Element
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let id: ID
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static func ==(lhs: Self, rhs: Self) -> Bool {
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return lhs.id == rhs.id
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}
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func hash(into hasher: inout Hasher) {
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hasher.combine(id)
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}
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}
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