... Several objects are predefined in core JavaScript and can be used in either client-side or server-side scripts. ... A handful of predefined functions can also be used in both client and server scripts. The predefined core objects are Array , Boolean , Date , Function , Math , Number , RegExp , and String . ... The predefined Function object specifies a string of JavaScript code to be compiled as a function. ... The Number and String functions let you convert an object to a number or a string. ...