The throw() method of AsyncGenerator instances acts as if a throw statement is inserted in the generator's body at the current suspended position, which informs the generator of an error condition and allows it to handle the error, or perform cleanup and close itself.

The [@@asyncIterator]() method of AsyncIterator instances implements the async iterable protocol and allows built-in async iterators to be consumed by most syntaxes expecting async iterables, such as for await...of loops. It returns the value of this, which is the async iterator object itself.

The [@@toPrimitive]() method of Symbol values returns this symbol value.

The Object.getOwnPropertyDescriptor() static method returns an object describing the configuration of a specific property on a given object (that is, one directly present on an object and not in the object's prototype chain). The object returned is mutable but mutating it has no effect on the original property's configuration.

The message data property of an Error instance is a human-readable description of the error.

The name data property of a Function instance indicates the function's name as specified when it was created, or it may be either anonymous or '' (an empty string) for functions created anonymously.

The caller accessor property of Function instances returns the function that invoked this function. For strict, arrow, async, and generator functions, accessing the caller property throws a TypeError.

The toSorted() method of Array instances is the copying version of the sort() method. It returns a new array with the elements sorted in ascending order.

The includes() method of String values performs a case-sensitive search to determine whether a given string may be found within this string, returning true or false as appropriate.

The toSpliced() method of Array instances is the copying version of the splice() method. It returns a new array with some elements removed and/or replaced at a given index.