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December 7, 2016 17:39
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Public Extension Submission
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| extension String { | |
| subscript(i: Int) -> Character { | |
| return self[index(startIndex, offsetBy: i)] | |
| } | |
| subscript(r: Range<Int>) -> String { | |
| return substring(with: index(startIndex, offsetBy: r.startIndex)..<index(startIndex, offsetBy: r.endIndex)) | |
| } | |
| } | |
| extension Int { | |
| func isPrime() -> Bool { | |
| return self > 1 && !(2..<self).contains { self % $0 == 0 } | |
| } | |
| } |
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