JavaScript Number.isFinite() Method
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