Loops in Javascript

Loops in JavaScript

The types of loops in javascript are:

1. for loop
2. while loop
3. do-while loop

For Loop

Iterates the elements for a fixed number of times. It should be used if a number of iterations are known.

<script type="text/javascript">  
var count;  
for (count=0; count < 5 ; count++){  
document.write("Current Count:"+ count);  
document.write("<br/>");  
}  
</script>

Output

Current Count: 0
Current Count: 1
Current Count :2
Current Count: 3
Current Count: 4

While Loop

Iterates the elements for an infinite number of times. It is mainly used if number of iterations is not known.

<script type="text/javascript">  
var count=0;  
while (count < 5){  
document.write("Current Count:"+ count+ "<br/>");  
count++;  
}  
</script>

Output

Current Count: 0
Current Count: 1
Current Count: 2
Current Count: 3
Current Count: 4

Do while Loop

It is similar to while loop except that the condition check happens at the end of the loop.

<script type="text/javascript">  
var count=0;  
do{  
document.write("Current Count:"+ count+"<br/>");  
count++;  
}while (count < 0);  
document.write("Loop stopped");  
</script>

Output

Current Count: 0
Loop Stopped