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Number Object (JavaScript)

JavaScript - Internet Explorer 10

An object that represents a number of any kind. All JavaScript numbers are 64-bit floating-point numbers.

numObj = new Number(value)

Parameters

numObj: Required. The variable name to which the Number object is assigned.
value: Required. The numeric value.

Remarks

JavaScript creates Number objects when a variable is set to a number value, for example var num = 255.336;. It is seldom necessary to create Number objects explicitly.

The Number object has its own properties and methods, in addition to the properties and methods inherited from Object. Numbers are converted into strings under certain circumstances, for example when a number is added or concatenated with a string, as well as by means of the toString method. For more information, see Addition Operator (+) (JavaScript).

JavaScript has several number constants. For a complete list, see Number Constants (JavaScript).

Requirements

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards. Also supported in Windows Store apps. See Version Information.

Properties

The following table lists the properties of the Number object.

Property	Description
constructor Property	Specifies the function that creates an object.
prototype Property	Returns a reference to the prototype for a class of objects.

Methods

The following table lists the methods of the Number object.

Method	Description
hasOwnProperty Method	Returns a Boolean value that indicates whether an object has a property with the specified name.
isPrototypeOf Method	Returns a Boolean value that indicates whether an object exists in another object's prototype hierarchy.
propertyIsEnumerable Method	Returns a Boolean value that indicates whether a specified property is part of an object and whether it is enumerable.
toExponential method	Returns a string that contains a number represented in exponential notation.
toFixed method	Returns a string that represents a number in fixed-point notation.
toLocaleString Method	Returns an object converted to a string based on the current locale.
toPrecision method	Returns a string that contains a number that is represented in either exponential or fixed-point notation and that has a specified number of digits.
toString Method	Returns a string representation of an object.
valueOf Method	Returns the primitive value of the specified object.

Reference

JavaScript Objects

Math Object (JavaScript)

new Operator (JavaScript)

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