JavaScript Application Cookbook

Top-Level Properties and Functions

Top-level properties and functions are not associated with any object. Table 1.68 details the top-level properties. Table 1.69 details the top-level functions.

Table A-68. Top-Level Properties

Property	Description	Version
infinity	A numeric value representing infinity.	1.3
NaN	A value representing Not-A-Number.	1.3
undefined	The value undefined.	1.3

Table A-69. Top-Level Functions

Function	Description	Version
escape	Returns the hexadecimal encoding of an argument in the ISO Latin-1 character set; used to create strings to add to a URL.	1.0
eval	Evaluates a string of JavaScript code without reference to a particular object.	1.0
isFinite	Evaluates an argument to determine whether it is not a number.	1.3
isNaN	Returns a string representing the specified object. Overrides the Object.toString method.	1.0
Number	Converts an object to a number.	1.2
parseFloat	floating-point number.	1.0
parseInt	integer.	1.0
string	Converts an object to a string.	1.2
unescape	Returns the ASCII string for the specified hexadecimal encoding value.	1.0