JS Practice — Built-in Objects

Math.ceil() Leaves Integers Unchanged

📖 Usage Example

// Round up to the nearest integer
Math.ceil(4.2)   // → 5
Math.ceil(-4.2)  // → -4

Use Math.ceil() when you need to round a number up to the next whole integer.

Math.ceil(x)

When the input is already an integer, Math.ceil() returns it unchanged. Math.ceil(4) returns 4.

Challenge: Verify that Math.ceil() is idempotent for integers.

💡 Hints (2)