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Swift circular array subscript
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| extension Array { | |
| subscript(circular index: Int) -> Element? { | |
| var i = index | |
| if i < 0 || isEmpty { | |
| return nil | |
| } else if i > count - 1 { | |
| i = index % count | |
| } | |
| return self[i] | |
| } | |
| } |
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