set.go

package main

import "golang.org/x/exp/maps"

type Set[T comparable] map[T]struct{}

func (s Set[T]) Add(v T)       { s[v] = struct{}{} }
func (s Set[T]) Remove(v T)    { delete(s, v) }
func (s Set[T]) Has(v T) bool  { _, has := s[v]; return has }
func (s Set[T]) List() []T     { return maps.Keys(s) }
func (s Set[T]) IsEmpty() bool { return len(s) == 0 }