//
//  String.swift
//
//
//  Created by AntonovIA on 12.10.2020.
//

import Foundation

extension String {
    
    private static let alphanumeric = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
    
    static func random(length: Int, allowedChars: String? = nil) -> String {
        let seq: String = ((allowedChars == nil) ? alphanumeric : allowedChars!) as String
        var rnd: String = ""
        
        for _ in 0..<length {
            let randInt = arc4random_uniform(UInt32(seq.count))
            rnd += "\(seq[seq.index(seq.startIndex, offsetBy: Int(randInt))])"
        }
        
        return rnd
    }
    
}