JS Practice — Built-in Objects

Number.isSafeInteger() — 3.0 is a safe integer

📖 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 — 3.0

3.0 === 3 in JavaScript, so Number.isSafeInteger(3.0) returns true.

💡 Hints (1)

• `3.0` has no fractional part and equals `3`, so it is a safe integer.