JS Practice — Built-in Objects

valueOf() — result is a number

📖 Usage Example

const d = new Date('2024-01-15T00:00:00.000Z')
d.valueOf()  // → 1705276800000
d.valueOf() === d.getTime()  // → true

Use valueOf() to get the millisecond timestamp of a Date; it equals getTime() and is called automatically in arithmetic expressions.

Date.prototype.valueOf()

valueOf() returns a number.

Challenge: Verify that typeof new Date(0).valueOf() returns 'number'.

💡 Hints (1)