random string in Go

random_string.go

func randomString(size int) string {
  alpha = `abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789` //better to define a const
  buf := make([]byte, size)
  for i := 0; i < size; i++ {
    buf[i] = alpha[rand.Intn(len(alpha))]
  }
  return string(buf)
}