[TOC] > [github](https://github.com/deckarep/golang-set) ## 安裝 ``` //方式一 requiredClasses := mapset.NewSet() requiredClasses.Add("Cooking") requiredClasses.Add("English") requiredClasses.Add("Math") requiredClasses.Add("Biology") scienceSlice := []interface{}{"Biology", "Chemistry"} scienceClasses := mapset.NewSetFromSlice(scienceSlice) electiveClasses := mapset.NewSet() electiveClasses.Add("Welding") electiveClasses.Add("Music") electiveClasses.Add("Automotive") bonusClasses := mapset.NewSet() bonusClasses.Add("Go Programming") bonusClasses.Add("Python Programming") allClasses := requiredClasses.Union(scienceClasses).Union(electiveClasses).Union(bonusClasses) fmt.Println(allClasses) //Is cooking considered a science class? fmt.Println(scienceClasses.Contains("Cooking")) //false //Show me all classes that are not science classes, since I hate science. fmt.Println(allClasses.Difference(scienceClasses)) //Set{Music, Automotive, Go Programming, Python Programming, Cooking, English, Math, Welding} //Which science classes are also required classes? fmt.Println(scienceClasses.Intersect(requiredClasses)) //Set{Biology} //How many bonus classes do you offer? fmt.Println(bonusClasses.Cardinality()) //2 //Do you have the following classes? Welding, Automotive and English? fmt.Println(allClasses.IsSuperset(mapset.NewSetFromSlice([]interface{}{"Welding", "Automotive", "English"}))) //true ```