JavaScript TypeError – “X” is not a function

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This JavaScript exception is not a function that occurs if someone trying to call a value from a function, but in reality, the value is not a function.

Message:

TypeError: Object doesn't support property or method {x} (Edge)
TypeError: "x" is not a function

Error Type:

TypeError

Cause of Error: There is an attempt to call a value from a function, but in reality, the value is not a function. Here the need is to provide a function, but that didn’t happen.

Example 1: In this example, the document.getElementByID is used as a function, which is not. So the error has occurred.

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <title>Type Error</title> 
</head> 
<body> 
    <script> 
    let x = document.getElementByID('GFG'); 
    document.write(x); 
    </script> 
</body> 
</html>

Output(In Chrome console):

TypeError: document.getElementByID is not a function

Example 2: In this example, the brackets are used as multiply But they are like calling a function. So the error has occurred.

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <title>Type Error</title> 
</head> 
<body> 
    <script> 
    const x = 4(4 + 5); 
    document.write(x); 
    </script> 
</body> 
</html>

Output(In Chrome console):

TypeError: 4 is not a function

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