JS Practice — Built-in Objects

Number.NaN — typeof

📖 Usage Example

// Represents Not-a-Number
Number.NaN        // → NaN
Number.isNaN(Number.NaN)  // → true
Number.NaN === Number.NaN // → false (NaN is never equal to itself)

Use Number.NaN as a named constant for Not-a-Number; always check for it with Number.isNaN() since NaN !== NaN.

typeof NaN

Despite its name, NaN's type is 'number'.

💡 Hints (1)

• `NaN` stands for "Not a Number" yet its typeof is `"number"` — a famous JS quirk.