Question

How to move the digits of a string with digits and letters to the beginning of the string in Swift

Answer 1

import Foundation
 
func moveDigitsToFront(of input: String) -> String {
    let digits = input.filter { $0.isNumber }
    let letters = input.filter { !$0.isNumber }
    
    return digits + letters
}


var str = "d2c54be3a1"
str = moveDigitsToFront(of: str)

print(str)

 
 
/*
run:
 
25431dcbea
 
*/

 

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