The trimEnd() method of String values removes whitespace from the end of this string and returns a new string, without modifying the original string. trimRight() is an alias of this method.

The link() method of String values creates a string that embeds this string in an <a> element (<a href="...">str</a>), to be used as a hypertext link to another URL.

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

The padStart() method of String values pads this string with another string (multiple times, if needed) until the resulting string reaches the given length. The padding is applied from the start of this string.

The Reflect.getOwnPropertyDescriptor() static method is like Object.getOwnPropertyDescriptor(). It returns a property descriptor of the given property if it exists on the object, undefined otherwise.

The Proxy() constructor creates Proxy objects.

The handler.ownKeys() method is a trap for the [[OwnPropertyKeys]] object internal method, which is used by operations such as Object.keys(), Reflect.ownKeys(), etc.

The Number.NaN static data property represents Not-A-Number, which is equivalent to NaN. For more information about the behaviors of NaN, see the description for the global property.

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

The clear() method of Map instances removes all elements from this map.