What is a Safe Integer?
A safe integer is an integer that has the following properties
- A number that 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
- Significant 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:
- Value: It is the number to be checked for safeinteger() method.
Return Value: The toExponential() method in JavaScript returns true if the value is a safe integer Number, else it returns false.
Below are examples of the Number isSafeInteger() Method.
Example 1: This example uses the safeinteger() method to check if 4 is a safe integer or not.
Javascript
console.log("Output : " + Number.isSafeInteger(44)); |
Output : true
Example 2: Passing a positive number as an argument in the isSafeInteger() method.
Javascript
console.log("Output : " + Number.isSafeInteger(23)); |
Output : true
Example 3: Passing a negative number as an argument in the isSafeInteger() method.
Javascript
console.log("Output : " + Number.isSafeInteger(-23)); |
Output : true
Example 4: Passing a number(with decimals) as an argument in the isSafeInteger() method.
Javascript
console.log("Output : " + Number.isSafeInteger(0.5)); |
Output : false
Example 5: Passing an equation( which equates to an infinite value) as an argument in the isSafeInteger() method.
Javascript
console.log("Output : " + Number.isSafeInteger(0 / 0)); |
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.
We have a complete list of Javascript Number Methods, to check those please go through the Javascript Number Complete Reference article.
Supported Browsers:
- Google Chrome 34 and above
- Firefox 32 and above
- Apple Safari 10 and above
- Opera 21 and above
- Edge 12 and above
