In javascript, what type is NaN?

The NaN attribute represents a “not a number” value. This special value is caused by an operation that cannot be performed, either because one of the operands is not a number (for example, “abc” / 4), or because the result of the operation is not a number (for example, the divisor to zero).

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First of all, although NaN means “not a number”, its type is Number.

console.log(typeof NaN === "number"); // logs "true"

Also, NaN and any Comparing something – even itself, results in false:

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

If you want to test whether a number is equal to NaN, you can use value !== value. Only yields true if the value is equal to NaN. Also, ES6 provides a new Number.isNaN() function, which is a different function and more reliable than the old global isNaN() function.

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