JS Practice — Built-in Objects

Number.isFinite() — NaN returns false

📖 Usage Example

// Check for finite numbers (no coercion)
Number.isFinite(42)        // → true
Number.isFinite(Infinity)  // → false
Number.isFinite('42')      // → false

Use Number.isFinite() to safely check if a value is a finite number without coercing non-number types as the global isFinite() does.

Number.isFinite() — NaN

💡 Hints (1)

• `NaN` is not finite — it is not a real number at all.