Introducing JavaScript Functions and Loops - While Loop
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While loops are used to execute code while a certain criteria is true. In the example below, I have recruited the Count from Sesame Street to help me tabulate how many people are reading this tutorial.
<html>
<body>
<script type="text/javascript">
i = 0
while (i <= 5)
{
document.write("The Count says: " + i + " Ah Ah Ah")
document.write("<br />")
i++
}
</script>
<p>There are 5 nerds reading this tutorial</p>
<p><b>AH AH AH!</b></p>
</body>
</html>
This script will print the following to the monitor:
The Count says: 0 Ah Ah Ah
The Count says: 1 Ah Ah Ah
The Count says: 2 Ah Ah Ah
The Count says: 3 Ah Ah Ah
The Count says: 4 Ah Ah Ah
The Count says: 5 Ah Ah Ah
There are 5 nerds reading this tutorial
AH AH AH!
The script works by giving our counter variable the value of 0. It then says to execute the code while the value of i is equal to or less than 5. The program then runs through the loop, printing our text and incrementing the value by one on each pass through the loop until the value reaches five. Then it exits the loop and goes on to print the lines: There are 5 nerds reading this tutorial and AH AH AH!
Well, that's all the time we have for this episode. In the next tutorial we will complete our discussion of Loops, covering the Do While Loop and learning how to break out of Loops, and possibly cover the For...In statement.
Till then...
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