Question

How to check if a string contains only digits in Swift

Answer 1

import Foundation

func checkString(string: String) -> Bool {
	let digits = CharacterSet.decimalDigits
	let stringSet = CharacterSet(charactersIn: string)

	return digits.isSuperset(of: stringSet)
}


if checkString(string: "89301") { 
	print("The string contains only digits")
} else {
	print("The string does not contain only digits")
}



/*
run:

The string contains only digits

*/

 

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