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May 22, 2017 13:16
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Extensions for Swift's Collection Type
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| extension Collection { | |
| // Usage: array[optional: 2] --> returns element at position 2 if possible, else returns nil | |
| subscript(optional i: Index) -> Iterator.Element? { | |
| return (self.startIndex ..< self.endIndex).contains(i) ? self[i] : nil | |
| } | |
| } |
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