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blainerothrock/Array+boundedLookup.swift

Created September 6, 2018 15:20
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Swift Safe Array Lookup
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Array+boundedLookup.swift
import Foundation
extension Array {
subscript (lookup index: Index) -> Element? {
return indices.contains(index) ? self[index] : nil
}
}
let array = [1,2,3,4,5]
array[lookup: 7] // nil
array[lookup: 1] // 2
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