How to get Random Character from String in Kotlin

In this tutorial, you shall learn how to get a random character from given string in Kotlin, using String.random() function, with examples.

Kotlin Get Random Character from String

To get random character from String in Kotlin, call random() method on this string.

Example

In the following example, we take a string in str, and call random() method on this string to get a character from this string randomly.

Main.kt

fun main(args: Array<String>) {
    var str = "abcd@$#1234"
    var result = str.random()
    println(result)
}

Output

d

We can use this function, to generate a password will allowed characters taken in a string.

In the following example, we generate a password of length 12 using String.random() method.

Main.kt

fun main(args: Array<String>) {
    var str = "abcdefghijklmnopqrstuvwxyzABCD@$#*123456789"
    var password = ""
    for (i in 1..12) {
        password += str.random()
    }
    println(password)
}

Output

9p5Anw4m46Bp

Conclusion

In this Kotlin Tutorial, we learned how to get a character randomly from given string using String.random() method, with the help of Kotlin example programs.