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JavaScript Number isSafeInteger() Method
The JavaScript Number isSafeInteger() method is used to determine whether the passed value is a number that is a safe integer or not. This method returns a boolean value 'true' if a number is a 'safe integer'; otherwise it returns 'false'.
What is Safe Inetger ?
The simple definition of the safe integer in JavaScript is all numbers we can represent under the IEEE-754 double-precision number. It is the set of all numbers that lie between the -(2^53) to (2^53) exclusive, and we can represent it in the standard way.
Syntax
Following is the syntax of JavaScript Number isSafeInteger() method −
Number.isSafeInteger(testValue)
Parameters
This method accepts a parameter named 'testValue'. The same is described below −
- testValue − The value to be checked for safe integer.
Return value
This method returns 'true' if number is a safe integer; 'false' otherwise.
Example 1
The following program demonstrates the usage of the JavaScript Number isSafeInteger() method. This method returns 'false' if we don't pass any value to it.
<html> <head> <title>JavaScript isSafeInteger() Method</title> </head> <body> <script> //without an argument document.write("Result = ", Number.isSafeInteger()); //output will be 'false' </script> </body> </html>
Output
The above program returns 'false'.
Result = false
Example 2
If the passed value is a 'safe integer', this method returns 'true'.
The following program uses the Number.isSafeInteger() method to check if '30' is a 'safe integer'.
<html> <head> <title>JavaScript isSafeInteger() Method</title> </head> <body> <script> let value = 30; document.write("Given number = ", value); document.write("<br>Is number ", value , " is a 'safe ineter' ? ", Number.isSafeInteger(value)); </script> </body> </html>
Output
Once the above program is executed, it will return 'true' in the output.
Given number = 30 Is number 30 is a 'safe ineter' ? true
Example 3
The method returns 'false' when the argument is not a 'safe integer'.
Here is another example of the JavaScript Number isSafeInteger() method. We check if 2 ** 53 is a 'safe integer' by passing it as an argument to this method.
<html> <head> <title>JavaScript isSafeInteger() Method</title> </head> <body> <script> let value = 2 ** 53; document.write("Give value = ", value); document.write("<br>Is number ", value , " is a 'safe integer' ? ", Number.isSafeInteger(value)); </script> </body> </html>
Output
After executing the above program, it will return 'false' in the output.
Give value = 9007199254740992 Is number 9007199254740992 is a 'safe integer' ? false
Example 4
Let's see what happens when we pass 'NaN' and 'Infinity' as an argument to this method, one at a time.
<html> <head> <title>JavaScript isSafeInteger() Method</title> </head> <body> <script> let val1 = NaN; let val2 = Infinity; document.write("Values are: ", val1 , " and ", val2); document.write("<br>Is value '", val1 , "' is a 'safe integer' ? ", Number.isSafeInteger(val1)); document.write("<br>Is value '", val2 , "' is a 'safe integer' ? ", Number.isSafeInteger(val2)); </script> </body> </html>
Output
The above program returns 'false' when either 'NaN' or 'Infinity' is passed as an argument.
Values are: NaN and Infinity Is value 'NaN' is a 'safe integer' ? false Is value 'Infinity' is a 'safe integer' ? false