Underscore.js _.isNumber() Function

Namachila November 12, 2025

0 1 1 minute read

The _.isNumber() function is used to check whether the given object parameter is number or not. If the given object is a number then it returns True value otherwise, it returns False.

Syntax:

_.isNumber( object )

Parameters: This function accepts one parameter as mentioned above and described below:

object: This parameter holds the object element that need to be check whether it is number or not.

Return Value: It returns True if the given object is number, False otherwise.

Example 1:

<!DOCTYPE html> 
<html> 
  
<head> 
    <script type="text/javascript" src= 
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js"> 
    </script> 
</head> 
  
<body> 
    <script type="text/javascript"> 
  
        var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; 
        console.log(_.isNumber(arr)); 
  
  
        var fun = function (element) { 
            return element % 2 != 0; 
        }; 
        console.log(_.isNumber(fun)); 
  
        var str = 'zambiatek'; 
        console.log(_.isNumber(str.length)); 
    </script> 
</body> 
  
</html> 

Output:

Example 2:

<!DOCTYPE html> 
<html> 
  
<head> 
    <script type="text/javascript" src= 
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js"> 
    </script> 
</head> 
  
<body> 
    <script type="text/javascript"> 
  
        console.log(_.isNumber(true)); 
        console.log(_.isNumber(10)); 
        console.log(_.isNumber('zambiatek')); 
        console.log(_.isNumber(15.675)); 
    </script> 
</body> 
  
</html> 

Output:

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