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Mr. Dubey • 52.77K Points
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Q. 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
  • Correct Answer - Option(D)
  • Views: 72
  • Filed under category JavaScript
Explanation by: Mr. Dubey 
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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