golang set type implementation

The idiomatic way to implement a set in Go 
	is to use a map.

set := make(map[string]bool) // New empty set
set["Foo"] = true            // Add
for k := range set {
             // Loop
    fmt.Println(k)
}
delete(set, "Foo")    // Delete
size := len(set)      // Size
exists := set["Foo"]  // Membership