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JavaScript Number isSafeInteger() Method
  • Last Updated : 18 Feb, 2021

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

  • Example:




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

    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));
    </script>

    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));
    </script>

    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));
    </script>

    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:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Apple Safari
  • Opera
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