Golang diff of string arrays

package main

import "fmt"

func difference(slice1 []string, slice2 []string) []string {
    var diff []string

    // Loop two times, first to find slice1 strings not in slice2,
    // second loop to find slice2 strings not in slice1
    for i := 0; i < 2; i++ {
        for _, s1 := range slice1 {
            found := false
            for _, s2 := range slice2 {
                if s1 == s2 {
                    found = true
                    break
                }
            }
            // String not found. We add it to return slice
            if !found {
                diff = append(diff, s1)
            }
        }
        // Swap the slices, only if it was the first loop
        if i == 0 {
            slice1, slice2 = slice2, slice1
        }
    }

    return diff
}

func main() {
    slice1 := []string{"foo", "bar", "hello"}
    slice2 := []string{"foo", "world", "bar", "foo"}

    fmt.Printf("%+v\n", difference(slice1, slice2))
}

Source: stackoverflow.com

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