set collection

go.mod

@@ -46,6 +46,7 @@ require (
 	github.com/creasty/defaults v1.5.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/davidlazar/go-crypto v0.0.0-20190912175916-7055855a373f // indirect
+	github.com/deckarep/golang-set v1.7.2-0.20201129021324-03b572015f8e // indirect
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/go-playground/locales v0.13.0 // indirect
 	github.com/go-playground/universal-translator v0.17.0 // indirect

go.sum

@@ -106,6 +106,10 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/davidlazar/go-crypto v0.0.0-20170701192655-dcfb0a7ac018/go.mod h1:rQYf4tfk5sSwFsnDg3qYaBxSjsD9S8+59vW0dKUgme4=
 github.com/davidlazar/go-crypto v0.0.0-20190912175916-7055855a373f h1:BOaYiTvg8p9vBUXpklC22XSK/mifLF7lG9jtmYYi3Tc=
 github.com/davidlazar/go-crypto v0.0.0-20190912175916-7055855a373f/go.mod h1:rQYf4tfk5sSwFsnDg3qYaBxSjsD9S8+59vW0dKUgme4=
+github.com/deckarep/golang-set v1.7.1 h1:SCQV0S6gTtp6itiFrTqI+pfmJ4LN85S1YzhDf9rTHJQ=
+github.com/deckarep/golang-set v1.7.1/go.mod h1:93vsz/8Wt4joVM7c2AVqh+YRMiUSc14yDtF28KmMOgQ=
+github.com/deckarep/golang-set v1.7.2-0.20201129021324-03b572015f8e h1:cZH/C3SR4/BGzKwFwtq5PfYqbKYeJpSFw/4coUAV0/A=
+github.com/deckarep/golang-set v1.7.2-0.20201129021324-03b572015f8e/go.mod h1:93vsz/8Wt4joVM7c2AVqh+YRMiUSc14yDtF28KmMOgQ=
 github.com/decred/dcrd/lru v1.0.0/go.mod h1:mxKOwFd7lFjN2GZYsiz/ecgqR6kkYAl+0pz0tEMk218=
 github.com/dgraph-io/badger v1.5.5-0.20190226225317-8115aed38f8f/go.mod h1:VZxzAIRPHRVNRKRo6AXrX9BJegn6il06VMTZVJYCIjQ=
 github.com/dgraph-io/badger v1.6.0-rc1/go.mod h1:zwt7syl517jmP8s94KqSxTlM6IMsdhYy6psNgSztDR4=

tool/set.go

+package tool
+
+// The missing set collection for the Go language. Until Go has sets built-in...use this.
+// https://github.com/deckarep/golang-set

tool/set_test.go

+package tool
+
+import (
+	"fmt"
+	"testing"
+
+	mapset "github.com/deckarep/golang-set"
+)
+
+func TestSet(t *testing.T) {
+	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")
+
+	// Show me all the available classes I can take
+	allClasses := requiredClasses.Union(scienceClasses).Union(electiveClasses).Union(bonusClasses)
+	fmt.Println(allClasses) // Set{Cooking, English, Math, Chemistry, Welding, Biology, Music, Automotive, Go Programming, Python Programming}
+
+	// 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
+}