# JavaScript Number Reference

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## JavaScript Numbers

JavaScript has only one type of number.

Numbers can be written with, or without, decimals:

## Example

var x = 3.14; // A number with decimals
var y = 34; // A number without decimals

Extra large or extra small numbers can be written with scientific (exponent) notation:

## Example

var x = 123e5; // 12300000
var y = 123e-5; // 0.00123

For a tutorial about JavaScript numbers, read our JavaScript Number Tutorial.

## Number Properties

Property | Description
--- | ---
constructor | Returns the function that created JavaScript's Number prototype
MAX_VALUE | Returns the largest number possible in JavaScript
MIN_VALUE | Returns the smallest number possible in JavaScript
NEGATIVE_INFINITY | Represents negative infinity (returned on overflow)
NaN | Represents a "Not-a-Number" value
POSITIVE_INFINITY | Represents infinity (returned on overflow)
prototype | Allows you to add properties and methods to an object

## Number Methods

Method | Description
--- | ---
toExponential(x) | Converts a number into an exponential notation
toFixed(x) | Formats a number with x numbers of digits after the decimal point
toPrecision(x) | Formats a number to x length
toString() | Converts a number to a string
valueOf() | Returns the primitive value of a number

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