//
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// BidirectionalCollectionExtensions.swift
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// SwifterSwift
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//
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// Created by Quentin Jin on 2018/10/13.
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// Copyright © 2018 SwifterSwift
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//
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// MARK: - Methods
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public extension BidirectionalCollection {
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/// SwifterSwift: Returns the element at the specified position. If offset is negative, the `n`th element from the end will be returned where `n` is the result of `abs(distance)`.
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///
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/// let arr = [1, 2, 3, 4, 5]
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/// arr[offset: 1] -> 2
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/// arr[offset: -2] -> 4
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///
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/// - Parameter distance: The distance to offset.
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subscript(offset distance: Int) -> Element {
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let index = distance >= 0 ? startIndex : endIndex
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return self[indices.index(index, offsetBy: distance)]
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}
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}
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