The toJSON() method of Date instances returns a string representing this date in the same ISO format as toISOString().

The getYear() method of Date instances returns the year for this date according to local time. Because getYear() does not return full years ("year 2000 problem"), it is deprecated and has been replaced by the getFullYear() method.

The source accessor property of RegExp instances returns a string containing the source text of this regular expression, without the two forward slashes on both sides or any flags.

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 RegExp.lastParen static accessor property returns the last parenthesized substring match, if any. RegExp["$+"] is an alias for this property.

The RegExp.leftContext static accessor property returns the substring preceding the most recent match. RegExp["$`"] is an alias for this property.

The for...of statement executes a loop that operates on a sequence of values sourced from an iterable object. Iterable objects include instances of built-ins such as Array, String, TypedArray, Map, Set, NodeList (and other DOM collections), as well as the arguments object, generators produced by generator functions, and user-defined iterables.

The filter attribute specifies the filter effects defined by the <filter> element that shall be applied to its element.

The JavaScript exception "repeat count must be less than infinity" occurs when the String.prototype.repeat() method is used with a count argument that is infinity.