https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Set/forEach
Set 인스턴스의 forEach() 메서드는 제공된 함수를 Set 요소 각각에 대해 삽입 순서대로 한 번씩 실행합니다.
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https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Set/clear
Set 实例的 clear() 方法移除该集合中的所有元素。
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/union
The union() method of Set instances takes a set and returns a new set containing elements which are in either or both of this set and the given set.
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https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Global_Objects/Set/has
La méthode has() renvoie un booléen qui indique s'il existe un élément de l'ensemble Set avec une certaine valeur.
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