The Atomics.xor() static method computes a bitwise XOR with a given value at a given position in the array, and returns the old value at that position. This atomic operation guarantees that no other write happens until the modified value is written back.

The Atomics.notify() static method notifies up some agents that are sleeping in the wait queue.

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The Promise[Symbol.species] static accessor property returns the constructor used to construct return values from promise methods.

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The dayOfWeek accessor property of Temporal.PlainDate instances returns a positive integer representing the 1-based day index in the week of this date. Days in a week are numbered sequentially from 1 to daysInWeek, with each number mapping to its name. It is calendar-dependent. 1 usually represents Monday in the calendar, even when locales using the calendar may consider a different day as the first day of the week (see Intl.Locale.prototype.getWeekInfo()).

The toLocaleString() method of Temporal.PlainMonthDay instances returns a string with a language-sensitive representation of this month-day. In implementations with Intl.DateTimeFormat API support, this method delegates to Intl.DateTimeFormat.

The until() method of Temporal.PlainDateTime instances returns a new Temporal.Duration object representing the duration from this date-time to another date-time (in a form convertible by Temporal.PlainDateTime.from()). The duration is positive if the other date-time is after this date-time, and negative if before.

The equals() method of Temporal.PlainYearMonth instances returns true if this year-month is equivalent in value to another year-month (in a form convertible by Temporal.PlainYearMonth.from()), and false otherwise. They are compared both by their underlying ISO date values and their calendars, so two year-months from different calendars may be considered equal by Temporal.PlainYearMonth.compare() but not by equals().