string and integer variable operation using Javascript

<!DOCTYPE html> 
 
<html lang="en"> 
<head> 
    <title>Chapter 2, Example 1</title> 
</head> 
<body> 
    <script> 
        var myFirstVariable; 
 
        myFirstVariable = "Hello"; 
        alert(myFirstVariable); 
 
        myFirstVariable = 54321; 
        alert(myFirstVariable); 
    </script> 
</body> 
</html>

Key source : Beginning JavaScript, 5th Edition (wrox)

Jeffrin Jose T

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