// Append append keys into set
Append append keys into set
// Append append keys into set
func (s *StringSet) Append(keys ...string) {
	for _, key := range keys {
		s.Data[key] = struct{}{}
	}
}
func ( s * StringSet ) Append ( keys ... string ) { for _ , key := range keys { s . Data [ key ] = struct { } { } } }
Append append keys into set
Append append keys into set