JavaScript Core Reference - Beginning JavaScript - page 689

Property Introduced Description

MIN_VALUE JavaScript 1.1 Returns the smallest number that can be represented in

JavaScript (5E-324).

NaN JavaScript 1.1 Returns a value that is “not a number.”

NEGATIVE_
INFINITY

JavaScript 1.1 Returns a value representing negative infi nity.

POSITIVE_
INFINITY

JavaScript 1.1 Returns a value representing (positive) infi nity.

prototype JavaScript 1.1 Returns the prototype for the object, which can be used to

extend the object's interface.

Methods
Method

Introduced Description

toExponential(fractionDigits) JavaScript 1.5 Returns a string containing the

exponent notation of a number. The
parameter should be between 0 and 20
and determines the number of digits
after the decimal.

toFixed([digits]) JavaScript 1.5 The format number for digits num-

ber of digits. The number is rounded
up, and 0 s are added after the decimal
point to achieve the desired decimal
length.

toPrecision([precision]) JavaScript 1.5 Returns a string representing the

Number object to the specifi ed
precision.

toString() JavaScript 1.1 Converts the Number object into a

string.

valueOf() JavaScript 1.1 Returns the primitive value of the

Number object.

Object
Object is the primitive type for JavaScript objects, from which all other objects are descended (that is,
all other objects inherit the methods and properties of the Object object). Introduced in JavaScript 1.0,
an Object object can be created using the Object constructor as follows:

var obj = new Object();