Generating a random string with given length in Go

We sometimes need to generate random strings like to generate passwords/ tokens etc.

Following program shows how to do that in Golang

package main
import (
  "fmt"
  "math/rand"
  "time"
)

var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")

func main() {
    rand.Seed(time.Now().UnixNano()) // for random to work
    fmt.Printf(GenerateRandomString(10))
}


func GenerateRandomString(n int) string {
    b := make([]rune, n)
        for i := range b {
        b[i] = letters[rand.Intn(len(letters))]
    }
    return string(b)
}

You can also run the program to see the output here https://onecompiler.com/go/3xm8qaba3