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Showing content from https://developer.mozilla.org/es/docs/Web/JavaScript/Reference/Global_Objects/Number/NaN below:

Number.NaN - JavaScript | MDN

Baseline Widely available

La propiedad Number.NaN representa Not-A-Number (No es numero). Equivalente de NaN.

function clean(x) {
  // eslint-disable-next-line use-isnan
  if (x === Number.NaN) {
    // Can never be true
    return null;
  }
  if (isNaN(x)) {
    return 0;
  }
}

console.log(clean(Number.NaN));
// Expected output: 0

No tienes que crear un objeto Number para acceder a esta propiedad estática (usa Number.NaN).

function sanitise(x) {
  if (isNaN(x)) {
    return Number.NaN;
  }
  return x;
}

See Testing against NaN on the NaN page.

• El objeto global NaN .
• El objeto Number al que pertenece.

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