Conditional Statements IF in JavaScript

Question

<!DOCTYPE html>
<html>
    <head>
        <title>Movie Fee</title>    
        <script>    
        //Declare variables to hold a user's input of 2 integers, using prompts     / 
        var age = prompt("Enter your age", "29");   
        var snackOption = prompt("Enter A, B, C or D for your snack option:\nA - popcorn and pop\nB - chocolate bar and pop\nC - popcorn and candy and pop\nD - None", "B");
        var coupon = prompt("Do you have a coupon?", "Yes");

        var movieFee = 0.0;
        var snack = 0.0;
        var coupon = 0.0;

        //Check the user's admission fee based on his age
        if(age > 65)
        {
            fee = 6;
        }
        else if (age > 11)
        {
            fee = 8.5;
        }
        else
        {
            fee = 5.5;
        }

        //Check the user's choice of snack choice
        if (snackOption ==="A")
        {
            snack = 7.9;
        }
        else if (snackOption === "B")
        {
            snack = 6.3;
        }
        else if (snackOption === "C")
        {
            snack = 8.9;
        }

        //Check if user has a coupon
        if(coupon === "Yes")
        {
            coupon = 2;
        }

        //Calculate the movie fee
        fee = fee + snack - coupon;

        //Output the total cost of going to the movie
        document.write("Total cost of going to the movie = $" + fee.toFixed(2) + "<br>");       
        </script>
    </head>
    <body>          
    </body>
</html>

Hi fellas, Why we don't need to declare the fee variable? That's whatI don't understand here

Answer 1 · 2020-03-02T19:18:57Z

March 2, 2020 7:18pm

Hi Mukhammadkhon - Variable scope. Inside the if statement the JavaScript interpreter treats: var fee = 6; as fee = 6. This is because the scope of fee is inside the if block. That is called block scope. Maybe your question comes from watching an older JavaScript course but today with ES6 we do want to use let/const in declaring block scope variables. This article covers those changes.

https://www.codepunker.com/blog/the-basics-of-variable-scope-in-javascript

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Conditional Statements IF in JavaScript

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Mark Wilkowske

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