Created
September 6, 2018 15:20
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Swift Safe Array Lookup
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| 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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