Question

How to generate random string in Go

Answer 1

package main
  
import (
    "fmt"
    "time"
    "math/rand"
)
 
func generateRandomString(size int) string {
    var allCharacters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
     
    arr := make([]rune, size)
    for i := range arr {
        arr[i] = allCharacters[rand.Intn(len(allCharacters))]
    }
     
    return string(arr)
}
  
func main() {
    rand.Seed(time.Now().UnixNano())
  
    fmt.Println(generateRandomString(10))
    fmt.Println(generateRandomString(6))
}
 
  
  
/*
run:
  
FZw7QNoE52
wEvNWu
  
*/

 

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Answer 2

package main

import (
    "crypto/rand"
    "math/big"
    "fmt"
)

func generateRandomString(length int) string {
    const allCharacters = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_"
    var result string
    
    for i := 0; i < length; i++ {
        index, _ := rand.Int(rand.Reader, big.NewInt(int64(len(allCharacters))))
        result += string(allCharacters[index.Int64()])
    }
    
    return result
}

func main() {
    fmt.Println(generateRandomString(10))
    fmt.Println(generateRandomString(6))
}




/*
run:
 
0YKuRrz9rY
5NMfIu
 
*/

 

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