If we have an object r and want to know if it is a Range object, we can write:
A. r typeof Range
B. r is Range
C. r equals Range
D. r instanceof Range
Answer: Option D
Solution (By Examveda Team)
The r instanceof Range returns true if r inherits from Range.prototype. The instanceof operatory does not actually check whether r was initialized by the Range constructor.This Question Belongs to Javascript >> Caching And Debugging
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