JavaScript | Number isSafeInteger()

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

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   OUTPUT:

   Output : true

2. Passing a negative number as an argument in the isSafeInteger() method.
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   <script type = "text/javascript">  document.write("Output : " + Number.isSafeInteger(-23)); </script>

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   OUTPUT:

   Output : true

3. Passing a number(with decimals) as an argument in the isSafeInteger() method.
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   <script type = "text/javascript">  document.write("Output : " + Number.isSafeInteger(0.5)); </script>

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   OUTPUT:

   Output : false

4. Passing an equation( which equates to an infinte value) as an argument in the isSafeInteger() method.
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   <script type = "text/javascript">  document.write("Output : " + Number.isSafeInteger(0 / 0)); </script>

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   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() function returns true else false.

Shubrodeep Banerjee

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