Question

How to generate random string without repetition in Swift

Answer 1

import Foundation

func generateUniqueRandomString(total: Int) -> String {
    let chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
    var result = ""
    var usedChars = Set<Character>()

    while result.count < total {
        let randomIndex = Int.random(in: 0..<chars.count)
        let randomChar = chars[chars.index(chars.startIndex, offsetBy: randomIndex)]

        if !usedChars.contains(randomChar) {
            result.append(randomChar)
            usedChars.insert(randomChar)
        }
    }

    return result
}

print(generateUniqueRandomString(total: 15))




/*
run:
  
RYAh8vTI1qBGbx9  

*/

 

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