ChayeORCode/Control Flow in JavaScript.html at main · ShifaRabbani/ChayeORCode · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Control Flow in JavaScript</title>
</head>
<body>
    <script>
        // *****************IF**********
        //  === also check data-type

        const userLoggedIn = true
        const debitCard = true
        const loggedInFromeGoogle =false
        const LoggedInFromeEmail =true

        if(userLoggedIn && debitCard){
            console.log("Allow to buy course");

        }
        if(loggedInFromeGoogle || LoggedInFromeEmail){
            console.log("User Logged in");

        }
            //           ******************************* Switch *****************
        // switch (key) {
        //     case value:

        //         break;

        //     default:
        //         break;
        // }

           const month =Number( prompt("Enetr only a number From 1 to 4"))
           switch (month) {
            case 1:
                console.log("January");
                break;
            case 2:
                console.log("Februry");
                break;
            case 3:
                console.log("March");
                break;
            case 4:
                console.log("April");
                break;
            default:
                console.log("Default Execution");

                break;
           }
        //    ***************************Truthi Or Falsy Values ***********************

        //   ***** flasy values = false, 0 , -0 , BigInt , 0n, Null, undefine , NaN ,""
        //   *****  Truthi Value = "0" , 'false' , " " ,[] , {} , function(){} empty function

        const userEmail = []
        if (userEmail){
            console.log("Got User Email");
        }else {
            console.log("Dont have user Eamil");
    }
            // check the falsy value 0

        if(userEmail.length === 0){
            console.log("Array is empty");
        }
                    //    Check empty Object

        const emptyObj ={}
        if (Object.keys(emptyObj).length === 0){
            console.log("Object is Empty");

        }

        // ****************************Nullish Coalescing Operator (??) null ,undefined
    //   Used in special Data Base
      let val1
      val1 =5 ?? 10   //Or
        val1= null ?? 10   //or  Also called a flag values
        val1 = undefined ?? 15
      console.log(val1);

// ***********************************Turnary Operator
 const iceTeaPrice =100
 iceTeaPrice <= 80 ? console.log("Less then 80") :console.log("More then 80");

   </script>
</body>
</html>