JS Practice — Built-in Objects

Number.NaN — producing NaN through operations

📖 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.

Operations That Produce NaN

Certain operations produce NaN: dividing 0 by 0, parsing non-numeric strings, etc.

💡 Hints (1)

• `NaN` propagates — any arithmetic involving `NaN` produces `NaN`.