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Question 14

Which strict-equality results are correct for NaN and the two signed zeros?

  1. NaN equals itself; 0 differs from -0
  2. NaN differs from itself; 0 equals -0Correct answer
  3. NaN equals itself; 0 equals -0
  4. NaN differs from itself; 0 differs from -0

Explanation

Under strict equality, NaN differs from every value including itself, while positive and negative zero compare equal. Object.is would produce the opposite outcomes for these special cases, but this prompt uses strict equality.

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Question 14: Which strict-equality results are correct for NaN and the… · JavaScript Fundamentals · Questena