Writing Scripts in Nashorn - Scripting in Java: Integrating with Groovy and JavaScript - page 142

Table 4-12. ( continued )

Method Description

toLocaleUpperCase() Works the same as the toUpperCase() , except that it

uses locale specific lowercase to uppercase character
mapping

toString() Returns the contents of the String object as a primitive

string value

trim() Returns a primitive string value by removing the

whitespaces from the string

valueOf() Same as toString()

The Number Object
The Number object is a function. It can be called as a function or a constructor. When it is
called as a function, it converts the supplied argument to a primitive number value.
If it is called with no argument, it returns the primitive number zero. When it is called
as a constructor, it returns a Number object that wraps the specified argument. You can
think of the Number object as the wrapper objects Integer , Long , Float , Double , Short ,
and Byte types in Java. The valueOf() method of the Number object returns the primitive
number value stored in the object. The following code shows how to use the Number
object as a function and a constructor:

// Converts the string "24" to a number 24 and assigns 24 to n1
var n1 = Number("24");

// Asigns zero to n2
var n2 = Number();

// Create a Number object for the nuembr 100.43
var n3 = new Number(100.43);

printf("n1 = %d, n2 = %d, n3 = %f", n1, n2, n3.valueOf());

n1 = 24, n2 = 0, n3 = 100.430000

The Number object contains several useful properties to work with numbers.
They are listed in Table 4-13 . All listed methods are defined in Number.prototype object.