Underscore.js _.functions() Function

Underscore.js _.isFunction() Function

Last Updated : 01 Aug, 2023

The _.isFunction() function is used to check whether the given object is function or not. It returns a Boolean value True if the given object is a function and returns False otherwise.

Syntax:

_.isFunction( object )

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

object: It contains the value of object that need to be check whether the object is function or not.

Return Value: It returns True if the given object is function and 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"> 
  
        console.log(_.isFunction(function (element) { 
            return element % 2 != 0; 
        })); 
  
        console.log(_.isFunction(function (n) { 
            return n < 2 ? n : fib(n - 1) + fib(n - 2); 
        })); 
    </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(_.isFunction(alert)); 
        console.log(_.isFunction(console.log)); 
        console.log(_.isFunction('GeeksgorGeeks')); 
    </script> 
</body> 
  
</html> 

Output:

Underscore.js _.functions() Function

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