// Create a new StringSet and add some elements to it mySet := util.StringSet{} mySet.Insert("foo") mySet.Insert("bar") mySet.Insert("baz") // Test if a string value is in the set using Has() if mySet.Has("foo") { fmt.Println("foo is in the set!") } else { fmt.Println("foo is not in the set.") } // Try a string value that isn't in the set if mySet.Has("qux") { fmt.Println("qux is in the set!") } else { fmt.Println("qux is not in the set.") }In this example, we create a new StringSet and insert three string values into it. We then use the Has() method to test whether two additional string values, "foo" and "qux", are members of the set. The results of these tests are printed to the console. Overall, the go github.com.googlecloudplatform.kubernetes.pkg.util StringSet package is a useful library for managing sets of string values in Kubernetes applications, and the Has() method provides a simple way to query the membership of these sets.