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If we have an object r and want to know if...

This question belongs to Javascript Caching And Debugging
Caching and Debugging
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If we have an object r and want to know if it is a Range object, we can write:

Answer & Solution
Correct Answer: Option D
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.
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