Related Articles
JavaScript Number isSafeInteger() Method
• Last Updated : 04 Sep, 2020

Below is the example of the Number isSafeInteger() Method.

• Example:

 `<``script` `type` `= ``"text/javascript"``>  ` `document.write("Output : " + Number.isSafeInteger(44)); ` ` `

• OUTPUT:
`Output : true`

What is a Safe Integer?
A safe integer is an integer which has the following properties

• A number which can be represented as an IEEE-754 double precision number i.e. all integers from (253 – 1) to -(253 – 1)).

What is an IEEE-754 double-precision number?
Double-precision floating-point format is a computer number format, which occupies 64 bits in computer memory.
It represents a wide range of numeric values by using a floating-point.

The IEEE 754 standard specifies a binary64 as having:

Sign bit: 1 bit
Exponent: 11 bits
Significand precision: 53 bits (52 explicitly stored) isSafeInteger() Method In JavaScript

The isSafeInteger() method in JavaScript is used to check whether a number is a safe integer or not.

Syntax:

`Number.isSafeInteger(Value)`

Parameters Used:
1. Value :It is the number to be check for safeinteger() method.

Return Value:
The toExponential() method in JavaScript returns true if the value is a safe integer Number, else it returns false.

Examples:

```Input : Number.isSafeInteger(23)
Output : true

Input : Number.isSafeInteger(-23)
Output : true

Input : Number.isSafeInteger(0.5)
Output : false

Input : Number.isSafeInteger(0/0)
Output : false

```
1. Passing a positive number as an argument in the isSafeInteger() method.

 `<``script` `type` `= ``"text/javascript"``>  ` `document.write("Output : " + Number.isSafeInteger(23)); ` ` `

OUTPUT:

`Output : true`
2. Passing a negative number as an argument in the isSafeInteger() method.

 `<``script` `type` `= ``"text/javascript"``>  ` `document.write("Output : " + Number.isSafeInteger(-23)); ` ` `

OUTPUT:

`Output : true`
3. Passing a number(with decimals) as an argument in the isSafeInteger() method.

 `<``script` `type` `= ``"text/javascript"``>  ` `document.write("Output : " + Number.isSafeInteger(0.5)); ` ` `

OUTPUT:

`Output : false`
4. Passing an equation( which equates to an infinte value) as an argument in the isSafeInteger() method.

 `<``script` `type` `= ``"text/javascript"``>  ` `document.write("Output : " + Number.isSafeInteger(0 / 0)); ` ` `

OUTPUT:

`Output : false`

Code Explanation:
JavaScript uses double-precision floating-point format numbers as specified in IEEE 754 and can only safely represent numbers between -(253 – 1) and 253 – 1.If the parameter passed lies in this specified range then the number.isSafeInteger() method returns true else false.

Supported Browsers: 