random.go

package main

import (
	"fmt"
	"math/rand"
	"reflect"
	"time"
)

const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"

type T struct {
	S string
	I int
}

func main() {
	rand.Seed(time.Now().UnixNano())
	y := []T{
		T{"string1", 1},
		T{"string2", 2},
		T{"string3", 3},
		T{"string4", 4},
	}

	result := []string{}
	for _, x := range y {
		v := reflect.ValueOf(x)

		r := ""
		comma := ""
		for i := 0; i < v.NumField(); i++ {
			r = r + fmt.Sprintf("%s%v", comma, v.Field(i))
			comma = ","
		}
		result = append(result, r)
	}

	fmt.Println(result)
	fmt.Println(RandStringBytes(10))
	fmt.Println(RandIntBytes(10))
	fmt.Println(RandFloats(1.10, 101.98))
}

func RandStringBytes(n int) string {
	b := make([]byte, n)
	for i := range b {
		b[i] = letterBytes[rand.Intn(len(letterBytes))]
	}
	return string(b)
}

func RandIntBytes(n int) int {
	return rand.Intn(100)
}

func RandFloats(min, max float64) float64 {
	return rand.Float64() * (max - min)
}

func RandFloatsList(min, max float64, n int) []float64 {
	res := make([]float64, n)
	for i := range res {
		res[i] = min + rand.Float64()*(max-min)
	}
	return res
}