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Weak set is not iterable, you cannot use for-of, keys(), values(), forEach() to traverse values
So what is its function? Is it just about storing objects?
set的性能高于map的，当你需要存不重复数据，并且你不关心数据顺序的时候，它的价值就体现了！
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set的性能高于map的，当你需要存不重复数据，并且你不关心数据顺序的时候，它的价值就体现了！