The includes() method of Array instances determines whether an array includes a certain value among its entries, returning true or false as appropriate.

The Array.from() static method creates a new, shallow-copied Array instance from an iterable or array-like object.

The values() method of Array instances returns a new array iterator object that iterates the value of each item in the array.

The toString() method of Array instances returns a string representing the specified array and its elements.

The round() method of Temporal.PlainDateTime instances returns a new Temporal.PlainDateTime object representing this date-time rounded to the given unit.

The round() method of Temporal.PlainTime instances returns a new Temporal.PlainTime object representing this time rounded to the given unit.

The monthsInYear accessor property of Temporal.PlainDate instances returns a positive integer representing the number of months in the year of this date. It is calendar-dependent.

The with() method of Temporal.PlainTime instances returns a new Temporal.PlainTime object representing this time with some fields replaced by new values. Because all Temporal objects are designed to be immutable, this method essentially functions as the setter for the time's fields.

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

The toPlainTime() method of Temporal.ZonedDateTime instances returns a new Temporal.PlainTime object representing the time portion of this date-time.