Functions as Values

JavaScript functions can be used any place other value can be used.

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
        function callFunction(aFunction, anArgument){ 
            return aFunction(anArgument); 
        } 
        
        function add10(num){ 
           return num + 10; 
        } 
        var result1 = callFunction(add10, 10); 
        
        document.writeln(result1); //20 
        
        function getGreeting(name){ 
            return "Hello, " + name; 
        } 
        var result2 = callFunction(getGreeting, "JavaScript"); 
        document.writeln(result2); //"Hello, JavaScript" 
       
    </script>
</head>
<body>
</body>
</html>
Click to view the demo
Home 
  JavaScript Book 
    Essential Types  

Function:
  1. The Function Type
  2. Function Declarations versus Function Expressions
  3. Functions as Values
  4. Returning a function from a function
  5. Function arguments
  6. this for function context
  7. Function caller
  8. Function length property
  9. Function apply()
  10. Function.call() method
  11. Function's bind() method
  12. Function toLocaleString() and toString()