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randoms.go
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randoms.go
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// Pipe - A small and beautiful blogging platform written in golang.
// Copyright (C) 2017-2019, b3log.org & hacpai.com
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package util
import (
"math/rand"
"time"
)
// RandInts returns a random integer array with the specified from, to and size.
func RandInts(from, to, size int) []int {
if to-from < size {
size = to - from
}
var slice []int
for i := from; i < to; i++ {
slice = append(slice, i)
}
var ret []int
for i := 0; i < size; i++ {
idx := rand.Intn(len(slice))
ret = append(ret, slice[idx])
slice = append(slice[:idx], slice[idx+1:]...)
}
return ret
}
// RandString returns a fixed length random string.
func RandString(n int) string {
rand.Seed(time.Now().UTC().UnixNano())
time.Sleep(time.Nanosecond)
letter := []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
b := make([]rune, n)
for i := range b {
b[i] = letter[rand.Intn(len(letter))]
}
return string(b)
}