The replaceAll() method of String values returns a new string with all matches of a pattern replaced by a replacement. The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match. The original string is left unchanged.

The toUpperCase() method of String values returns this string converted to uppercase.

The RegExp[Symbol.species] static accessor property returns the constructor used to construct copied regular expressions in certain RegExp methods.

The [Symbol.search]() method of RegExp instances specifies how String.prototype.search should behave.

The RegExp.$1, …, RegExp.$9 static accessor properties return parenthesized substring matches.

The has() method of WeakMap instances returns a boolean indicating whether an element with the specified key exists in this WeakMap or not.

The get() method of WeakMap instances returns a specified element from this WeakMap.

The findLastIndex() method of Array instances iterates the array in reverse order and returns the index of the first element that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned.

The fill() method of Array instances changes all elements within a range of indices in an array to a static value. It returns the modified array.

The toLocaleString() method of Array instances returns a string representing the elements of the array. The elements are converted to strings using their toLocaleString methods and these strings are separated by a locale-specific string (such as a comma ",").