I have 3 string slices:

enp_slice := []string{"10.10.10.10", "10.10.10.11"}
cachedenp_slice := []string{"10.10.10.10", "10.10.10.11", "10.10.10.12"}
result := []string{}

I want to compare the 2 string slices and get distict elements in both of them and store them into the 3rd slice(element present in cachedenp_slice but not in enp_slice) like following:

result = ["10.10.10.12"]

CodePudding user response：

This should work for you.
I iterated over the two slices and take the elements of the second slice that are not present in the first one. I used a bool variable called isFound to understand if the current item was found or not. Below you can find the code:

package main

import "fmt"

func main() {
    enp_slice := []string{"10.10.10.10", "10.10.10.11"}
    cachedenp_slice := []string{"10.10.10.10", "10.10.10.11", "10.10.10.12"}
    result := []string{}

    for _, v := range cachedenp_slice {
        isFound := false
        for _, w := range enp_slice {
            if v == w {
                isFound = true
                break
            }
        }
        if !isFound {
            result = append(result, v)
        }
    }

    fmt.Printf("%v\n", result)
}

Let me know if works also for you.

CodePudding user response：

Another option is to convert the target slice to map, then check the origin slice with this map

Sample codes

func main() {
    enp_slice := []string{"10.10.10.10", "10.10.10.11"}
    cachedenp_slice := []string{"10.10.10.10", "10.10.10.11", "10.10.10.12"}
    fmt.Println(diffSlice(cachedenp_slice, enp_slice))
}

func diffSlice(origin, target []string) []string {
    m := make(map[string]struct{}, len(target))
    for _, v := range target {
        m[v] = struct{}{}
    }

    var result []string
    for _, v := range origin {
        if _, ok := m[v]; !ok {
            result = append(result, v)
        }
    }

    return result
}

https://go.dev/play/p/wOM5MZnZrcd