如何使用go获取切片中的单个项目计数？

Question

For example, this is a slice:

[1, 2, 3, 3, 4]

want to get single data 1, 2, 4 's count and return count = 3.

Maybe remove duplicate items(include itself) is an idea, but didn't find suitalbe method.

---

What I tried:

  func removeDuplicateItems() {
      intSlice := []int{1, 2, 3, 3, 4}
      fmt.Println(intSlice)

      keys := make(map[int]bool)
      list := []int{}
      for _, entry := range intSlice {
          if _, value := keys[entry]; !value {
              keys[entry] = true
              list = append(list, entry)
          }
      }

      fmt.Println(list)
  }

Got

[1 2 3 3 4]
[1 2 3 4]

Answer 1

I just changed your function a little bit:

func removeDuplicateItems() {
    intSlice := []int{1, 2, 3, 3, 4}
    fmt.Println(intSlice)

    keys := make(map[int]int)
    list := []int{}
    for _, entry := range intSlice {
        keys[entry]++
    }
    for k, v := range keys {
        if v == 1 {
            list = append(list, k)
        }
    }

    fmt.Println(list)
}

https://play.golang.org/p/ESFLhC4VC-l

At this point the list is not sorted. If you want to sort your list afterward you need to use the sortpackage.