Javascript isFinite Function

As its name indicates, Javascript isFinite function is used to determines whether value is a legal finite number or not. In Javascript isFinite function is used with Number object.

When you are working on number calculation or any other operation related to number and value assigned to variable is not valid finite number. In such situation your code will thrown an error.

To avoid such instances you have to check whether variable value or assigned value is legal finite number or not.

Syntax

isFinite("5678");
isFinite("isFinite");
isFinite("5678-34");

Javascript isFinite Function Example

<!DOCTYPE html>
<html>  
<head>  <!-- www.techstrikers.com -->
<title>My first Javascript code</title>   
</head>  
<body bgcolor="#bnde45">
<fieldset>
<legend>Javascript isFinite Function</legend>
<script> 

document.write(isFinite(0));
document.write("</br>");
document.write(isFinite("isFinite"));
document.write("</br>");
document.write(isFinite(-1.891));
document.write("</br>");
document.write(isFinite("12"));
document.write("</br>");
document.write(isFinite("2015/4/8"));

</script>
</fieldset>
</body>  
</html>

See Live Example

« Previous