JS Number Object

JavaScript

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In this tutorial we will learn about JavaScript Number Object.

Number is one of the JavaScript object to work with numbers.

Creating Number object

In the following example we a number object.

var numObj = new Number(10);

console.log(typeof numObj);	//this will print object

Following are some of the properties and methods of Number object that we can use.

Number Properties

MAX_VALUE

This holds a constant value that represents the maximum value that a number object can hold before JavaScipt interprets it as positive infinity.

The following example we will print value of MAX_VALUE in browser console.

console.log(Number.MAX_VALUE);

Output

1.7976931348623157e+308

MIN_VALUE

This holds a constant value that represents the minimum value that a number object can hold before JavaScipt interprets it as negative infinity.

The following example we will print value of MIN_VALUE in browser console.

console.log(Number.MIN_VALUE);

Output

5e-324

POSITIVE_INFINITY

This represents the value of positive infinity.

The following example we will print value of POSITIVE_INFINITY in browser console.

console.log(Number.POSITIVE_INFINITY);

Output

Infinity

NEGATIVE_INFINITY

This represents the value of negative infinity.

The following example we will print value of NEGATIVE_INFINITY in browser console.

console.log(Number.NEGATIVE_INFINITY);

Output

-Infinity

NaN

This represents the value of "Not a Number".

The following example we will print value of NaN in browser console.

console.log(Number.NaN);

Output

NaN

The best way to get this value is to divide a String by Number.

console.log("Hello World" / 10);

Output

NaN

typeof NaN is number though NaN stands for "Not a Number"

console.log(typeof NaN);	//this will print number

Number Methods

toFixed( )

This method will return a string. The value of this string represents a rounded number having specified number of digits after the decimal.

In the following example we have a number object. We are using the toFixed() method to have 3 decimal places.

var num = new Number(123.4567890);

console.log(num.toFixed(3));	//this will print 123.457

toPrecision( )

This method will return a string. The value of this string represents a rounded number having specified number of significant digit.

In the following example we have a number object. We are using the toPrecision() method to have 3 specified number of significant digit.

var num = new Number(1.234567890);

console.log(num.toPrecision(3));	//this will print 1.23

toString( )

This method will return a string equal to the value of the Number object.

In the following example we have a number object. We are using the toString() method to get the string value.

var num = new Number(1.234567890);

console.log(num.toString());	//this will print 1.23456789

toExponential( )

This method will return a string which represent the number in exponential form.

In the following example we have a number object. We are using the toExponential() method to get the string value in exponential form.

var num = new Number(123.4567890);

console.log(num.toExponential());	//this will print 1.23456789e+2
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