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JavaScript Number.isFinite() Method

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  • Last Updated : 24 Dec, 2021

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

  • Example: 

Javascript




<script type="text/javascript">
    document.write(Number.isFinite(111));          
</script>

  • Output: 
true

The Number.isfinite() method in JavaScript is used to check whether the passed value is a finite number or not.

The Number.isfinite() method is different from the isfinite() method since this method doesn’t forcibly convert the parameter to a number and it does not return true for any value that is not of the type number. On the other hand, the global isfinite() method converts the tested value to a number first and then tests it.

Syntax:  

Number.isFinite(value)

Parameters: This method accepts a single parameter value. It is the number which the user wants to check for finiteness.

Return Value: The number.isfinite() method returns a boolean value i.e. either true or false. It returns true if the passed value is of the type Number, and equates to a finite number else it returns false.

Below are some examples to illustrate the Number.isFinite() method in JavaScript:  

  • Passing a negative number as an argument: If the negative number passed to the method is finite then the method will return true otherwise false. 

Javascript




<script type="text/javascript">
    document.write(Number.isFinite(-2));          
</script>

Output: 

true
  • Passing a positive number as an argument: If the positive number passed to the method is finite then the method will return true otherwise false. 

Javascript




<script type="text/javascript">
    document.write(Number.isFinite(2));          
</script>

Output: 

true
  • Passing zero as an argument: If zero is passed to the method then the method will return true as zero is a finite number. 

Javascript




<script type="text/javascript">
    document.write(Number.isFinite(0));          
</script>

Output: 

true
  • Passing an equation as an argument: If the equation evaluates to a finite number then the method will return true otherwise false. 

Javascript




<script type="text/javascript">
    document.write(Number.isFinite(7-3+2));          
</script>

Output: 

true
  • Passing an equation (resulting in infinite) as an argument: If the equation after evaluating does not gives a finite numeric value then the method will return false. 

Javascript




<script type="text/javascript">
    document.write(Number.isFinite(0/0));          
</script>

Output: 

false
  • Passing a word as an argument: Since a word is not of type integer, so the Number.isFinite() will not convert it to number and will return false.

Javascript




<script type="text/javascript">
    document.write(Number.isFinite("strong"));          
</script>

Output: 

false
  • Passing number(string) as an argument: Since a string is not of type integer, so the Number.isFinite() will not convert it to number and will return false. 

Javascript




<script type="text/javascript">
    document.write(Number.isFinite("5"));          
</script>

Output: 

false

Supported Browsers:  

  • Google Chrome 19
  • Internet Explorer 12
  • Firefox 16
  • Apple Safari 09
  • Opera 15 and above

 


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