Temporal.PlainMonthDay.prototype.equals()
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The equals() method of Temporal.PlainMonthDay instances returns true if this month-day is equivalent in value to another month-day (in a form convertible by Temporal.PlainMonthDay.from()), and false otherwise. They are compared both by their underlying ISO date values and their calendars.
Note:
PlainMonthDay objects keep track of a reference ISO year, which is also used in the comparison. This year is automatically set when using the Temporal.PlainMonthDay.from() method, but can be set manually using the Temporal.PlainMonthDay() constructor, causing two equivalent month-days to be considered different if they have different reference years. For this reason, you should avoid using the constructor directly and prefer the from() method.
Syntax
equals(other)
Parameters
other-
A string, an object, or a
Temporal.PlainMonthDayinstance representing the other month-day to compare. It is converted to aTemporal.PlainMonthDayobject using the same algorithm asTemporal.PlainMonthDay.from().
Return value
true if this month-day is equal to other both in their date value and their calendar, false otherwise.
Examples
Using equals()
const md1 = Temporal.PlainMonthDay.from("2021-08-01");
const md2 = Temporal.PlainMonthDay.from({ year: 2020, month: 8, day: 1 }); // Year doesn't matter
console.log(md1.equals(md2)); // true
const md3 = Temporal.PlainMonthDay.from("2021-08-01[u-ca=japanese]");
console.log(md1.equals(md3)); // false
const md4 = Temporal.PlainMonthDay.from("2021-08-02");
console.log(md1.equals(md4)); // false
Specifications
| Specification |
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| Temporal # sec-temporal.plainmonthday.prototype.equals |
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Legend
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- Full support
- Full support
- No support
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- See implementation notes.