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JavaScript for Loops

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We have seen different variants of while loop. This chapter will explain another popular loop called for loop.

The for Loop

The for loop is the most compact form of looping and includes the following three important parts:

You can put all the three parts in a single line separated by a semicolon.

Syntax:

for (initialization; test condition; iteration statement){
     Statement(s) to be executed if test condition is true
}

Example:

Following example illustrates a basic for loop:

<script type="text/javascript">
<!--
var count;
document.write("Starting Loop" + "<br />");
for(count = 0; count < 10; count++){
  document.write("Current Count : " + count );
  document.write("<br />");
}
document.write("Loop stopped!");
//-->
</script>

This will produce following result which is similar to while loop:

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! 

To understand it in better way you can Try it yourself.


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