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I have this funtion

function riddle (parme) {
  if(parme !== parme) {
    return true;
  }
  return false;
}

when will it return true (I dont know the language)

about 4 years ago · Juan Pablo Isaza

Answer question

Accepted Answer · 2022-07-09T08:48:17.107Z

There is only a single value in JS which is not equal to itself which is NaN. Rest in all cases, it will print false

To check for NaN equality, You should use isNaN

function riddle(parme) {
  if (parme !== parme) {
    return true;
  }
  return false;
}

console.log(riddle(NaN));