go - How to extract character from array in golang? -

need extract random characters string

here got:

const letterbytes = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"   b := make([]byte, 1) := range b {     b[i] = letterbytes[rand.intn(len(letterbytes))] } fmt.println(string(b)) 

but returns "x" but, need return every time new character using rand function. appreciated. thanks.

start seeding pseudorandom number generator. example,

package main  import (     "fmt"     "math/rand"     "time" )  func main() {     rand.seed(time.now().unixnano())     const letterbytes = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"     b := make([]byte, 7)     := range b {         b[i] = letterbytes[rand.intn(len(letterbytes))]     }     fmt.println(string(b)) } 

output:

jfxtysc 

---

the go playground

about playground

in playground time begins @ 2009-11-10 23:00:00 utc (determining significance of date exercise reader). makes easier cache programs giving them deterministic output.

therefore, in go playground, time.now().unixnano() returns same value. random seed value, run code on computer.

---

for unicode code point (go rune),

package main  import (     "fmt"     "math/rand"     "time" )  package main  import (     "fmt"     "math/rand"     "time" )  func main() {     rand.seed(time.now().unixnano())     chars := []rune("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz世界!@=")     r := make([]rune, 50)     := range r {         r[i] = chars[rand.intn(len(chars))]     }     fmt.println(string(r)) } 

output:

世qrysp=@gijmikly=txrefjtvkee!yhhtsqhvlyuydrnibbilw