45.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Scope, If else</If-else></title>
</head>
<body>
    <div class="p">Hello</div>
    <script>
        // var is global so using same variable twice can cause problem so we use let as it will show the error
        // This will show error due to reuse
        // let a=6;
        // console.log(a);
        // let a=8;
        // console.log(a);

        let a=6;
        console.log(a);

        //local scope
        {
            let a=9;
            console.log(a);
        }

        const s="This cannot change";
        console.log(s);
        
        // will show error
        // s="Change it";
        // console.log(s);
        
        let age=31;
        if(age>18)
        console.log("can vote");
        else
        console.log("can't vote");

        const cup=1;
        switch(cup){
            case 1:
                console.log("Can drink");
                break;
            case 2:
                console.log("Can't drink");
                break;
            default:
                console.log("Default");
        }

    </script>
</body>
</html>