-
Notifications
You must be signed in to change notification settings - Fork 71
/
rand.go
44 lines (37 loc) · 1.01 KB
/
rand.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
//
// DISCLAIMER
//
// Copyright 2023 ArangoDB GmbH, Cologne, Germany
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
package util
import (
"math/rand"
"time"
)
var localRand = rand.New(rand.NewSource(time.Now().Unix()))
func Rand() *rand.Rand {
return localRand
}
func RandomElement[T interface{}](in []T) (T, bool) {
if len(in) == 0 {
return Default[T](), false
}
if len(in) == 1 {
return in[0], true
}
return in[Rand().Perm(len(in))[0]], true
}