Day1.html

<html>
    <head>
        <body>
            <script>
                // Unlike other language we dont want to use
                // datatypes like string,int ,javascript will
                // implicitly manage the datatypes according to the values
                //old javascript "var" will be used instead of let
                let day1="Welcome day1"; 
                day1="Hey have nice day" //this will be override the previous value
                console.log(`${day1} ponmani`)//[output] Hey have nice day ponmani
                alert(day1);
                alert(typeof(day1)); //output will be "String"
                
                let hey=7;
                alert(typeof(hey));//output will be "number"
                
            
                const dayy1="Welcome day1";
                dayy1="Hey its const"; 
                alert(dayy1);//this will give "Uncaught type error we cant override it"
            </script>
        </body>
    </head>
</html>