The toString() method of Array instances returns a string representing the specified array and its elements.

The indexOf() method of TypedArray instances returns the first index at which a given element can be found in the typed array, or -1 if it is not present. This method has the same algorithm as Array.prototype.indexOf().

A Segments object is an iterable collection of the segments of a text string. It is returned by a call to the segment() method of an Intl.Segmenter object.

The keys() method of Map instances returns a new map iterator object that contains the keys for each element in this map in insertion order.

The Math.LOG2E static data property represents the base 2 logarithm of e, approximately 1.442.

The Math.SQRT2 static data property represents the square root of 2, approximately 1.414.

The map() method of Iterator instances returns a new iterator helper that yields elements of the iterator, each transformed by a mapping function.

The at() method of String values takes an integer value and returns a new String consisting of the single UTF-16 code unit located at the specified offset. This method allows for positive and negative integers. Negative integers count back from the last string character.

The small() method of String values creates a string that embeds this string in a <small> element (<small>str</small>), which causes this string to be displayed in a small font.

The sup() method of String values creates a string that embeds this string in a <sup> element (^str), which causes this string to be displayed as superscript.