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 getTimeZones() method of Intl.Locale instances returns a list of supported time zones for this locale.

The has() method of WeakMap instances returns a boolean indicating whether an element with the specified key exists in this WeakMap or not.

The get() method of WeakMap instances returns a specified element from this WeakMap.

The Iterator.from() static method creates a new Iterator object from an iterator or iterable object.

The forEach() method of Iterator instances is similar to Array.prototype.forEach(): it executes a provided function once for each element produced by the iterator.

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.

The compile() method of RegExp instances is used to recompile a regular expression with new source and flags after the RegExp object has already been created.

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