Create random string on index of array

Question

func randomStringWithLength (len : Int) -> NSString {

    let answer : NSString =  ArrAnswer.objectAtIndex(0) as! NSString
    let letters : NSString = answer
    print(letters)
    let randomString : NSMutableString = NSMutableString(capacity: len)

    for (var i=0; i < len; i++){
        let length = UInt32 (letters.length)
        let rand = arc4random_uniform(length)
        randomString.appendFormat("%C", letters.characterAtIndex(Int(rand)))

    }

    return randomString
}

i have already try this, Some latter missing in to converted string at every time or some time print a latter twice or thrice time.

user3441734 · Accepted Answer · 2015-11-30 08:36:55Z

1

i am not sure what exactly do you need. if you need randomize characters in string, you can use something like this

import Foundation
let str = "abcdef"

// returns string with random order of characters
func randomize(str: String)->String {
    var chars = str.characters.map{ $0 }
    let c = UInt32(chars.count)
    if c < 2 { return str}

    for i in 0..<(c - 1) {
        let j = arc4random_uniform(c)
        if i != j {
            swap(&chars[Int(i)], &chars[Int(j)])
        }
    }
    return chars.reduce("", combine: { (str, c) -> String in
        str + String(c)
    })
}
for i in 0...10 {
    print(randomize(str))
}
/* prints

dcbeaf
edcabf
cebadf
adcbef
dacbef
dceabf
eacbdf
adebcf
adcbef
bedcaf
daebcf

*/

edited Nov 30, 2015 at 8:36

answered Nov 30, 2015 at 8:24

user3441734

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Comments

CTABUYO · Accepted Answer · 2015-11-30 07:09:19Z

1

I think this is the best way to do it, unless otherone has another way, you may need to adapt this code for your necesities:

let array = ["Frodo", "sam", "wise", "gamgee"]
let randomIndex = Int(arc4random_uniform(UInt32(array.count)))
print(array[randomIndex])

answered Nov 30, 2015 at 7:09

CTABUYO

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1 Comment

ikbal Over a year ago

i want to convert index of string like "Frodo" i don't get random index.

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