Number - NaN (Not A Number)


NaN, or Not a Number, is a value that returns when impossible things are asked in arithmetic – like:

  • divide zero by zero.
  • or during the bad coercion

NaN (paradoxically named not a number) is a special floating-point value in the IEEE floating-point standard.


Not equal to itself

The IEEE floating-point standard requires that NaN must be treated as unequal to itself.

Demo in Javascript:

console.log(NaN === NaN);    // false

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