JS Practice — Built-in Objects

setMonth() — set to 11 (December)

📖 Usage Example

const d = new Date(2024, 0, 15)
d.setMonth(5)
d.getMonth()  // → 5 (June)

Use setMonth() to mutate the month (0-indexed) of a Date object in place and get back the updated timestamp.

Date.prototype.setMonth()

Setting month to 11 gives December (the maximum valid month index).

Challenge: Verify that after setMonth(11), getMonth() returns 11.

💡 Hints (1)