Why Typeof NaN is a number?

The type of NaN , which stands for Not a Number is, surprisingly, a number. The reason for this is, in computing, NaN is actually technically a numeric data type. However, it is a numeric data type whose value cannot be represented using actual numbers. It instead means that the value cannot be expressed with numbers.

Why is my function returning NaN?

NaN , which stands for “Not a Number”, is a value that JavaScript returns from certain functions and operations when the result should be a number, but the result is not defined or not representable as a number. sqrt() returns NaN if the given value is negative: Math.

Why does NaN == NaN always return false?

If y is NaN, return false. This means that the algorithm first checks if one of the operands is NaN before even checking their types and if so it will return false anyways.

What does NaN return?

By definition, NaN is the return value from operations which have an undefined numerical result. Hence why, in JavaScript, aside from being part of the global object, it is also part of the Number object: Number. NaN. It is still a numeric data type , but it is undefined as a real number .

What is NaN type?

In computing, NaN (/næn/), standing for Not a Number, is a member of a numeric data type that can be interpreted as a value that is undefined or unrepresentable, especially in floating-point arithmetic.

Is NaN a primitive type?

NaN is a primitive Number value. Just like 1 , 2 , etc. NaN is a property of the global object. The initial value of NaN is Not-A-Number — the same as the value of Number.

What does NaN mean in coding?

not a number
IEEE 754 floating point numbers can represent positive or negative infinity, and NaN (not a number). These three values arise from calculations whose result is undefined or cannot be represented accurately.

Why does NaN not equal itself?

The “Why” NaN is not equal to NaN Short Story: According to IEEE 754 specifications any operation performed on NaN values should yield a false value or should raise an error. Thanks CJ J for sharing this. TLDR; is “Because the IEEE standard says so”.

What are the two types of NaN?

In fact, IEEE 754 defines two types of NaN – a quiet NaN ( qNaN ) and a signalling NaN ( sNaN ). The most important difference between the two is that sNaN will cause an exception when used in arithmetic operations and qNaN won’t.