What is NaN in JavaScript?

NaN means “Not a Number”. It is the result of a maths operation that has no valid number as result.

console.log(Number("abc"));
console.log(0 / 0);
console.log(NaN === NaN);
console.log(Number.isNaN(NaN));
console.log(typeof NaN);

Output:

NaN is the only value that is not equal to itself, so check it with Number.isNaN(). Its type is number.

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