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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 valueOf() method of Temporal.PlainYearMonth instances throws a TypeError, which prevents Temporal.PlainYearMonth instances from being implicitly converted to primitives when used in arithmetic or comparison operations.

The era accessor property of Temporal.PlainDateTime instances returns a calendar-specific lowercase string representing the era of this date, or undefined if the calendar does not use eras (e.g., ISO 8601). era and eraYear together uniquely identify a year in a calendar, in the same way that year does. It is calendar-dependent.

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().

The search() method of String values executes a search for a match between a regular expression and this string, returning the index of the first match in the string.

The Symbol.isConcatSpreadable static data property represents the well-known symbol Symbol.isConcatSpreadable. The Array.prototype.concat() method looks up this symbol on each object being concatenated to determine if it should be treated as an array-like object and flattened to its array elements.

The Symbol.species static data property represents the well-known symbol Symbol.species. Methods that create copies of an object may look up this symbol on the object for the constructor function to use when creating the copy.