JavaScript Number Object

The JavaScript number object enables you to represent a numeric value. It may be integer or floating-point. JavaScript number object follows IEEE standard to represent the floating-point numbers.

By the help of Number() constructor, you can create number object in JavaScript. For example:

var n=new Number(value);  

If value can’t be converted to number, it returns NaN(Not a Number) that can be checked by isNaN() method.

You can direct assign a number to a variable also. For example:

var x=102;//integer value  

var y=102.7;//floating point value  

var z=13e4;//exponent value, output: 130000  

var n=new Number(16);//integer value by number object

Output:

102 102.7 130000 16  

JavaScript Number Constants

Let’s see the list of JavaScript number constants with description.

Constant	Description
MIN_VALUE	returns the largest minimum value.
MAX_VALUE	returns the largest maximum value.
POSITIVE_INFINITY	returns positive infinity, overflow value.
NEGATIVE_INFINITY	returns negative infinity, overflow value.
NaN	represents “Not a Number” value.

JavaScript Number Methods

Let’s see the list of JavaScript number methods with their description.

Methods	Description
isFinite()	It determines whether the given value is a finite number.
isInteger()	It determines whether the given value is an integer.
parseFloat()	It converts the given string into a floating point number.
parseInt()	It converts the given string into an integer number.
toExponential()	It returns the string that represents exponential notation of the given number.
toFixed()	It returns the string that represents a number with exact digits after a decimal point.
toPrecision()	It returns the string representing a number of specified precision.
toString()	It returns the given number in the form of string.