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01
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How is circular reference control done with WeakSet?
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A.
Set should be used for circular reference control; WeakSet cannot be used because it cannot be iterated
B.
WeakSet keeps visited objects weak; after cycle detection object automatically cleaned when GC-ed
C.
WeakSet does not have has() method so visit check cannot be done
D.
WeakMap should be used for circular reference control; WeakSet does not accept primitive keys
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