JavaScript Do While Loop

Loops - do-while Loop

do...while Loop :

'do-while' is a variant of 'while' loop.

This will execute a block of code once before checking any condition.

Then, after executing the block it will evaluate the condition given at the end of the block of code.

Now the statements inside the block of code will be repeated till condition evaluates to true.

We implement this using the following syntax:

javascript do while loop syntax

The value for the variable used in the test condition, should be updated inside the loop only.

Below example shows incrementing variable counter 5 times using do...while loop:

Also, shown below is output for every iteration of the loop.

JS Do while loop example

Demo :

        div#maincontent {
            height: 200px;
            width: 500px;
            border: 1px solid #CEE2FA;
            text-align: left;
            color: #08438E;
            font-family: calibri;
            font-size: 20;
            padding: 5px;

        div#heading {
            text-decoration: bold;
            text-align: center;
            margin-top: 80px;
            width: 500px;
            border: 1px solid #CEE2FA;
            text-align: center;
            color: #08438E;
            background-color: #CEE2FA;
            font-family: calibri;
            font-size: 20;
            padding: 5px;

        h2 {
            padding: 0;
            margin: 0;
        <div id="heading">
            <h2>Booking Summary</h2>
        <div id="maincontent">
                var seats = 3;
                var costPerTicket = 320;
                var discount = 10;
                var total = seats * costPerTicket;
                const percent = 100;
                var discountedCost;
                totalCost = 0;
                  "Actual cost per ticket: Rs." + costPerTicket + "<br><br>"
                ); //Requirement 2 b: Calculating discount based on the sequence of customers booking the ticket
                index = 1;
                do {
                  discountedCost =
                    costPerTicket - (discount / percent) * costPerTicket;
                  document.write(discount + " % off on ticket " + index + "<br>");
                  totalCost = totalCost + discountedCost;
                  discount = discount + 2;
                } while (index <= seats);
                  "<br>" + "Actual amount for " + seats + " tickets: Rs." + total
                document.write("<br>" + "Amount payable: Rs." + totalCost);
#do_while_loop_javascript #do-while_Loop_in_javascript #javascript_do_while #js_do_while #javascript_do_while_break

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