Temporal.PlainMonthDay.prototype.valueOf()

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

experimental technology
Check the Browser compatibility table carefully before using this in production.

The valueOf() method of implicitly converted to primitives when used in arithmetic or comparison operations.

Syntax

valueOf()

Parameters

None.

Return value

None.

Exceptions

TypeError: Always thrown.

Description

Because both Temporal.PlainMonthDay.prototype.toString().

Examples

Arithmetic and comparison operations on Temporal.PlainMonthDay

All arithmetic and comparison operations on Temporal.PlainMonthDay instances should use the dedicated methods or convert them to primitives explicitly.

const md1 = Temporal.PlainMonthDay.from("01-01");
const md2 = Temporal.PlainMonthDay.from("07-01");
md1 > md2; / TypeError: can't convert PlainMonthDay to primitive type
Temporal.PlainDate.compare(
  md1.toPlainDate({ year: 2021 }),
  md2.toPlainDate({ year: 2021 }),
); / -1

md2 - md1; / TypeError: can't convert PlainMonthDay to primitive type
md2
  .toPlainDate({ year: 2021 })
  .since(md1.toPlainDate({ year: 2021 }))
  .toString(); / "P181D"

Specifications

Specification
Temporal # sec-temporal.plainmonthday.prototype.valueof