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random.go
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random.go
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package utils
import (
"math/rand"
"time"
)
type Random struct {
*rand.Rand
}
func NewRandom() *Random {
random := &Random{}
random.Rand = rand.New(rand.NewSource(time.Now().UnixNano()))
return random
}
func (r *Random) RandIntn(num int) int {
if num == 0 {
return 0
}
return r.Intn(num)
}
func (r *Random) RandInt(a, b int) int {
if a == b {
return a
}
if a > b {
return r.Intn(a-b) + b
} else {
return r.Intn(b-a) + a
}
}
func (r *Random) Shuffle(arr []interface{}) {
arrLen := len(arr)
if arrLen <= 1 {
return
}
pos := 0
for i := 1; i < arrLen; i++ {
idx := arrLen - i
pos = r.Intn(idx)
arr[pos], arr[idx] = arr[idx], arr[pos]
}
}
//==========================================================================
var GRand *Random = NewRandom()
// arr := []int{1, 2, 3, 4, 5}
// utils.GRand.Shuffle(arr)
// fmt.Println(arr)