The toPlainTime() method of Temporal.PlainDateTime instances returns a new Temporal.PlainTime object representing the time part (hour, minute, second, and subsecond components) of this date-time.

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

The reduce() method of Iterator instances is similar to Array.prototype.reduce: it executes a user-supplied "reducer" callback function on each element produced by the iterator, passing in the return value from the calculation on the preceding element. The final result of running the reducer across all elements is a single value.

The FinalizationRegistry() constructor creates FinalizationRegistry objects.

The segment() method of Intl.Segmenter instances segments a string according to the locale and granularity of this Intl.Segmenter object.

The [Symbol.iterator]() method of Segments instances implements the iterable protocol and allows Segments objects to be consumed by most syntaxes expecting iterables, such as the spread syntax and for...of loops. It returns a segments iterator object that yields data about each segment.

The String.raw() static method is a tag function of template literals. This is similar to the r prefix in Python, or the @ prefix in C# for string literals. It's used to get the raw string form of template literals — that is, substitutions (e.g., ${foo}) are processed, but escape sequences (e.g., \n) are not.

The toString() method of String values returns this string value.

The valueOf() method of String values returns this string value.

The fontsize() method of String values creates a string that embeds this string in a <font> element (<font size="...">str</font>), which causes this string to be displayed in the specified font size.