JS Practice — Built-in Objects

Number.isSafeInteger() — MAX_SAFE_INTEGER + 1 is not safe

📖 Usage Example

// Check if an integer is safely representable
Number.isSafeInteger(42)                // → true
Number.isSafeInteger(9007199254740991)  // → true  (MAX_SAFE_INTEGER)
Number.isSafeInteger(9007199254740992)  // → false

Use Number.isSafeInteger() to verify that an integer can be precisely represented in JavaScript without floating-point rounding.

isSafeInteger Beyond the Boundary

💡 Hints (1)

• One step beyond `MAX_SAFE_INTEGER` is no longer safe.