JavaScript SyntaxError – Missing formal parameter
Last Updated :
24 Jul, 2020
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 ‘GeeksforGeeks’ 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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