JavaScript SyntaxError – Missing formal parameter

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This JavaScript exception missing formal parameter occurs if any function declaration doesn’t have the valid parameters.

Message:

SyntaxError: missing formal parameter (Firefox)

Error Type:

SyntaxError

Cause of Error: The function declaration is missing the formal parameters.

Example 1: In this example, the parameter ‘num’ is not defined in the list of formal parameters, So the error has occurred.

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <title>Syntax Error</title> 
</head> 
<body> 
    <script> 
    function cube(5) { 
      return num * num * num; 
    } 
    </script> 
</body> 
</html>

Output(In Firefox console):

SyntaxError: missing formal parameter

Example 2: In this example, the parameter ‘zambiatek’ is not defined in a list of formal parameters, So the error has occurred.

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <title>Syntax Error</title> 
</head> 
<body> 
    <script> 
    function GFG("Geek") { 
      return GeeksForGeeks; 
    }; 
    </script> 
</body> 
</html>

Output(In Firefox console):

SyntaxError: missing formal parameter

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