package set

type Set map[interface{}]struct{}

func NewSet() Set {
	return make(map[interface{}]struct{})
}

func (s Set) Add(i interface{}) {
	s[i] = struct{}{}
}

func (s Set) Has(i interface{}) bool {
	_, ok := s[i]
	return ok
}

func (s Set) Size() int {
	return len(s)
}

func (s Set) Keys() []interface{} {
	keys := make([]interface{}, 0)

	for k := range s {
		keys = append(keys, k)
	}

	return keys
}