while (expression){
Statement(s) to be executed if expression is true
}
Example
Try the following example to implement while loop.
<html>
<body>
<script type="text/javascript">
<!--
var count = 0;
document.write("Starting Loop ");
while (count < 10){
document.write("Current Count : " + count + "<br />");
count++;
}
document.write("Loop stopped!");
//-->
</script>
<p>Set the variable to different value and then try...</p>
</body>
</html>
Output
Starting Loop
Current Count : 0
Current Count : 1
Current Count : 2
Current Count : 3
Current Count : 4
Current Count : 5
Current Count : 6
Current Count : 7
Current Count : 8
Current Count : 9
Loop stopped!
Set the variable to different value and then try...
The do...while Loop
The do...while loop is similar to the while loop except that the condition check happens at the end of the loop. This means that the loop will always be executed at least once, even if the condition is false.
Flow Chart
The flow chart of a do-while loop would be as follows −
Syntax
The syntax for do-while loop in JavaScript is as follows −
do{
Statement(s) to be executed;
} while (expression);
Note − Don’t miss the semicolon used at the end of the do...while loop.
Example
Try the following example to learn how to implement a do-while loop in JavaScript.
<html>
<body>
<script type="text/javascript">
<!--
var count = 0;
document.write("Starting Loop" + "<br />");
do{
document.write("Current Count : " + count + "<br />");
count++;
}
while (count < 5);
document.write ("Loop stopped!");
//-->
</script>
<p>Set the variable to different value and then try...</p>
</body>
</html>
Output
Starting Loop
Current Count : 0
Current Count : 1
Current Count : 2
Current Count : 3
Current Count : 4
Loop Stopped!
Set the variable to different value and then try...
