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.