The formatRange() method of Intl.DateTimeFormat instances formats a date range in the most concise way based on the locales and options provided when instantiating this Intl.DateTimeFormat object.

The toLowerCase() method of String values returns this string converted to lower case.

The charCodeAt() method of String values returns an integer between 0 and 65535 representing the UTF-16 code unit at the given index.

The slice() method of String values extracts a section of this string and returns it as a new string, without modifying the original string.

The test() method of RegExp instances executes a search with this regular expression for a match between a regular expression and a specified string. Returns true if there is a match; false otherwise.

The codePointAt() method of String values returns a non-negative integer that is the Unicode code point value of the character starting at the given index. Note that the index is still based on UTF-16 code units, not Unicode code points.

The startsWith() method of String values determines whether this string begins with the characters of a specified string, returning true or false as appropriate.

The Intl.NumberFormat object enables language-sensitive number formatting.

The Math.cos() static method returns the cosine of a number in radians.

The cause data property of an Error instance indicates the specific original cause of the error.