JavaScript: The Definitive Guide, 6th Edition

Name

Number — support for numbers

Inherits from

Object → Number

Constructor

new Number(value)
Number(value)

Arguments

value

The numeric value of the Number object being created or a value to be converted to a number.

Returns

When Number() is used with the new operator as a constructor, it returns a newly constructed Number object. When Number() is invoked as a function without the new operator, it converts its argument to a primitive numeric value and returns that value (or NaN if the conversion failed).

Constants

Number.MAX_VALUE

The largest representable number.

Number.MIN_VALUE

The smallest representable number.

Number.NaN

Not-a-number value.

Number.NEGATIVE_INFINITY

Negative infinite value; returned on overflow.

Number.POSITIVE_INFINITY

Infinite value; returned on overflow.

Methods

toString()

Converts a number to a string using a specified radix (base).

toLocaleString()

Converts a number to a string using local number-formatting conventions.

toFixed()

Converts a number to a string that contains a specified number of digits after the decimal place.

toExponential()

Converts a number to a string using exponential notation with the specified number of digits after the decimal place.

toPrecision()

Converts a number to a string using the specified number of significant digits. Uses exponential or fixed-point notation depending on the size of the number and the number of significant digits specified.

valueOf()

Returns the primitive numeric value of a Number object.

Description

Numbers are a basic, primitive datatype ...