JS Practice — Built-in Objects

Number.isInteger() — '4' (string) is not an integer

📖 Usage Example

// Check if a value is an integer
Number.isInteger(42)    // → true
Number.isInteger(42.5)  // → false
Number.isInteger('42')  // → false

Use Number.isInteger() to verify that a value is a whole number, without type coercion.

Number.isInteger() — No Coercion

Unlike some JS checks, Number.isInteger() does not coerce strings.

💡 Hints (1)