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JavaScript do-while Loop



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The do-while loop in JavaScript is used in the case where you want a group of statements to be executed at least once.

Since the condition is placed at the end of the loop in case of do-while loop in JavaScript, therefore you can use this loop to executed group of statements at least once.

Here is the general form of do-while loop in JavaScript:

do {
   // block of code to be executed here
   // incrementation
} while(condition);

JavaScript do-while Loop Example

Here is an example illustrates how to use do-while loop in JavaScript:

<!DOCTYPE HTML>
<html>
<head>
   <title>JavaScript do-while Loop</title>
</head>
<body>

<h3>JavaScript do-while Loop Example</h3>
<script type="text/javascript">
   
   var num = 2;
   document.write("Printing the table of " + num + "<br/>");
   var i = 1;
   do
   {
      document.write(num*i + "<br/>");
      i++;
   } while(i<=10);
   document.write("Done!");
   
</script>

</body>
</html>

Here is the sample output of the above JavaScript do-while loop example:

javascript do-while loop

Here is another example of do-while in JavaScript. This example shows you the difference between while and do-while loop.

<!DOCTYPE HTML>
<html>
<head>
   <title>JavaScript do-while Loop</title>
</head>
<body>

<h3>JavaScript do-while Loop Example</h3>
<script type="text/javascript">
   
   var num = 2;
   document.write("Printing the table of " + num + "<br/>");
   var i = 1;
   do
   {
      document.write(num*i + "<br/>");
      i++;
   } while(i>10);
   document.write("Done!");
   
</script>

</body>
</html>

Here is the sample output of the above do-while loop in JavaScript example:

javascript do-while loop example

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