check for equality on slices without order

Here is an alternate solution, though perhaps a bit verbose:

func sameStringSlice(x, y []string) bool {
    if len(x) != len(y) {
        return false
    }
    // create a map of string -> int
    diff := make(map[string]int, len(x))
    for _, _x := range x {
        // 0 value for int is 0, so just increment a counter for the string
        diff[_x]++
    }
    for _, _y := range y {
        // If the string _y is not in diff bail out early
        if _, ok := diff[_y]; !ok {
            return false
        }
        diff[_y]--
        if diff[_y] == 0 {
            delete(diff, _y)
        }
    }
    return len(diff) == 0
}

Try it on the Go Playground