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WeakRef

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Exercises (10)

○WeakRef — instanceof
Beginner
○WeakRef — typeof
Beginner
○WeakRef — deref returns original object
Beginner
○WeakRef — deref preserves properties
Beginner
○WeakRef — primitive throws
Intermediate
○WeakRef.deref — returns original object
Beginner
○WeakRef.deref — access property
Beginner
○WeakRef.deref — typeof result
Beginner
○WeakRef.deref — array reference
Beginner
○WeakRef.deref — is a function
Beginner