The delete() method of Set instances removes a specified value from this set, if it is in the set.

The union() method of Set instances takes a set and returns a new set containing elements which are in either or both of this set and the given set.

The difference() method of Set instances takes a set and returns a new set containing elements in this set but not in the given set.

The isDisjointFrom() method of Set instances takes a set and returns a boolean indicating if this set has no elements in common with the given set.

The size accessor property of Set instances returns the number of (unique) elements in this set.

The trimEnd() method of String values removes whitespace from the end of this string and returns a new string, without modifying the original string. trimRight() is an alias of this method.

The Intl.NumberFormat.supportedLocalesOf() static method returns an array containing those of the provided locales that are supported in number formatting without having to fall back to the runtime's default locale.

The strike() method of String values creates a string that embeds this string in a <strike> element (<strike>str</strike>), which causes this string to be displayed as struck-out text.

The RegExp.$1, …, RegExp.$9 static accessor properties return parenthesized substring matches.

import.meta.resolve() is a built-in function defined on the import.meta object of a JavaScript module that resolves a module specifier to a URL using the current module's URL as base.