QuestenaPractice that shows what to review next
SearchCreate a test
Question 12

Which pair of results is produced by Object.is(NaN, NaN) and Object.is(0, -0), respectively?

  1. false for NaN, false for signed zero
  2. true for NaN, false for signed zeroCorrect answer
  3. false for NaN, true for signed zero
  4. true for NaN, true for signed zero

Explanation

Object.is regards NaN as the same as itself and distinguishes positive zero from negative zero. Strict equality behaves differently in both special cases, so using its outcomes here would reverse the pair.

Continue with this test

Start practice
Understand this topic (≈6 min)Back to test
Question 12: Which pair of results is produced by Object.is(NaN, NaN)… · JavaScript Fundamentals · Questena