The Object.preventExtensions() static method prevents new properties from ever being added to an object (i.e. prevents future extensions to the object). It also prevents the object's prototype from being re-assigned.

The RegExp.rightContext static accessor property returns the substring following the most recent match. RegExp["$'"] is an alias for this property.

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

The Symbol.replace static data property represents the well-known symbol Symbol.replace. The String.prototype.replace() and String.prototype.replaceAll() methods look up this symbol on their first argument for the method that replaces substrings matched by the current object.

The Math.LN2 static data property represents the natural logarithm of 2, approximately 0.693:

The lastIndexOf() method of Array instances returns the last index at which a given element can be found in the array, or -1 if it is not present. The array is searched backwards, starting at fromIndex.

The Math.LOG10E static data property represents the base 10 logarithm of e, approximately 0.434.

The [Symbol.iterator]() method of Array instances implements the iterable protocol and allows arrays to be consumed by most syntaxes expecting iterables, such as the spread syntax and for...of loops. It returns an array iterator object that yields the value of each index in the array.

The entries() method of Array instances returns a new array iterator object that contains the key/value pairs for each index in the array.

The find() method of Array instances returns the first element in the provided array that satisfies the provided testing function. If no values satisfy the testing function, undefined is returned.