The baseName accessor property of Intl.Locale instances returns a substring of this locale's string representation, containing core information about this locale, including the language, and the script and region if available.

The hourCycle accessor property of Intl.Locale instances returns the hour cycle type for this locale.

The getWeekInfo() method of Intl.Locale instances returns a weekInfo object with the properties firstDay, weekend and minimalDays for this locale.

The resolvedOptions() method of Intl.DurationFormat instances returns a new object with properties reflecting the locale and date and time formatting options computed during initialization of this Intl.DurationFormat object.

The BigInt64Array() constructor creates BigInt64Array objects. The contents are initialized to 0n.

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 buffer accessor property of DataView instances returns the ArrayBuffer or SharedArrayBuffer referenced by this view at construction time.

The RegExp.input static accessor property returns the string against which a regular expression is matched. RegExp.$_ is an alias for this property.

The getFloat64() method of DataView instances reads 8 bytes starting at the specified byte offset of this DataView and interprets them as a 64-bit floating point number. There is no alignment constraint; multi-byte values may be fetched from any offset within bounds.

The setInt8() method of DataView instances takes a number and stores it as an 8-bit signed integer in the byte at the specified byte offset of this DataView.