QuestenaPráctica que te muestra qué repasar después
BuscarCrear una prueba
Pregunta 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 zeroRespuesta correcta
  3. false for NaN, true for signed zero
  4. true for NaN, true for signed zero

Explicación

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.

Continúa con este test

Empezar la práctica
Comprender este tema (≈6 min)Volver a la prueba
Pregunta 12: Which pair of results is produced by Object.is(NaN, NaN)… · JavaScript Fundamentals · Questena