We can use the **`isFunction` method** to check whether a variable is a function or not.

# 
## Syntax

```jQuery
jQuery.isFunction( value )
```

`value` - This variable to be checked is passed as an argument to this method.

## Return value
This method returns `True` if the argument is a function. Otherwise, it returns `False`.

## Code example 
The code written below demonstrates how we use the `isFunction` method:

<html>
 <head>
 </head>
 <body>
   
   <script src="https://code.jquery.com/jquery-3.5.0.js"></script>
   <script>
     // check if an object is function 
     var obj = {name: "Educative"};
     console.log("jQuery.isFunction(obj) :" + jQuery.isFunction(obj));

      // check if a variable is a function 
     var val = 10;
     console.log("jQuery.isFunction(10) :" + jQuery.isFunction(obj));
    // check the function 
    function hi(){
      console.log("hi");
    }
    console.log("jQuery.isFunction(hi) :" + jQuery.isFunction(hi));
    </script>
 </body>
</html>

codemirror

console

## Code explanation



**Line 6**: We include the `jQuery` file.

**Lines 9–10**: We create an object `obj` and use the `isFunction` method to check if `obj` is a function. The `isFunction` method returns `False`, because `obj` is not a function. 

**Lines 13–14**: We create a variable `val` with a value of `10` and use the `isFunction` method to check if `val` is a function. The `isFunction` method returns `False`, because the `val` is not a function. 
 
**Lines 16–19**: We create a function with the name `hi` and use the `isFunction` method to check if `hi` is a function. The `isFunction` method returns `True`, because `hi` is a function. 

How to check if a variable is a function in jQuery

Syntax

Return value

Code example

Code explanation