The flags accessor property of RegExp instances returns the flags of this regular expression.

The has() method of WeakSet instances returns a boolean indicating whether an object exists in this WeakSet or not.

The Uint8Array() constructor creates Uint8Array objects. The contents are initialized to 0.

The delete() method of WeakSet instances removes the specified element from this WeakSet.

The Float64Array() constructor creates Float64Array objects. The contents are initialized to 0.

The Atomics.add() static method adds a given value at a given position in the array and returns the old value at that position. This atomic operation guarantees that no other write happens until the modified value is written back.

The entries() method of Map instances returns a new map iterator object that contains the [key, value] pairs for each element in this map in insertion order.

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

The JSON.rawJSON() static method creates a "raw JSON" object containing a piece of JSON text. When serialized to JSON, the raw JSON object is treated as if it is already a piece of JSON. This text is required to be valid JSON.

The Uint16Array() constructor creates Uint16Array objects. The contents are initialized to 0.