The toString() method of Symbol values returns a string representing this symbol value.

The Symbol() function returns primitive values of type Symbol.

The Symbol.for() static method searches for existing symbols in a runtime-wide symbol registry with the given key and returns it if found. Otherwise a new symbol gets created in the global symbol registry with this key.

The Symbol.split static data property represents the well-known symbol @@split. The String.prototype.split() method looks up this symbol on its first argument for the method that splits a string at the indices that match the current object.

The Intl.Segmenter() constructor creates Intl.Segmenter objects.

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

The deref() method of WeakRef instances returns this WeakRef's target value, or undefined if the target value has been garbage-collected.

A WeakRef object lets you hold a weak reference to another object, without preventing that object from getting garbage-collected.

The ReferenceError object represents an error when a variable that doesn't exist (or hasn't yet been initialized) in the current scope is referenced.

A WeakSet is a collection of garbage-collectable values, including objects and non-registered symbols. A value in the WeakSet may only occur once. It is unique in the WeakSet's collection.