21 lines
548 B
Swift
21 lines
548 B
Swift
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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public extension Collection {
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/// Returns the element at the specified index iff it is within bounds, otherwise nil.
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subscript (safe index: Index) -> Element? {
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return indices.contains(index) ? self[index] : nil
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}
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}
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public extension Array {
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func chunked(by chunkSize: Int) -> [[Element]] {
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return stride(from: 0, to: self.count, by: chunkSize).map {
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Array(self[$0..<Swift.min($0 + chunkSize, self.count)])
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}
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}
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}
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