如何使用golang检查数组中的重复元素？

Question

I have made a code to generate random numbers and delete the repeated ones like below:

package main

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

func main() {
    list := [7]int{}
    for i := 0; i < 7; i++ {
    here:
        rand.Seed(time.Now().UnixNano())
        s := rand.Intn(16)
        fmt.Println(s)
        if s != list[0] && s != list[1] && s != list[2] && s != list[3] && s != list[4] && s != list[5] && s != list[6] {
            list[i] = s
        } else {
            goto here
        }

    }
    fmt.Println("list:", list)
}

I noticed that there were a lot repeated code like:

s!=list[0]&&list[1]

But when I write it to:

s!=list[0:6]

It is wrong, how can I do this properly?

Answer 1

Store it in map.

like that

rndmap := make(map[int]bool)

for len(rndmap) < YOUR_LEN {
    rndmap[rand.Intn(YOUR_MAX_RAND)] = true
}

Result map will never store repeated indexes.

You can convert it into slice like this

rndslice := make([]int,0)
for i, _ := range rndmap {
    rndslice = append(rndslice, i)
}