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Check if String contains only digits
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| import Foundation | |
| extension String { | |
| var containsOnlyDigits: Bool { | |
| let notDigits = NSCharacterSet.decimalDigits.inverted | |
| return rangeOfCharacter(from: notDigits, options: String.CompareOptions.literal, range: nil) == nil | |
| } | |
| } |
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