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JavaScript Cert. Exam
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Introduction to JavaScript
Using JavaScript on your Webpage
A Simple JavaScript Application
Variables & Operators
Variables
Operators
Loops & Conditionals
Loops
Conditionals
Document Object Model
Nodes
Functions & Methods
Built-in Functions
User Defined Functions
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Forms
Events
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Cookies
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Timing Events

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Loops


Loops are required when you want the same piece of code to run again and again till a condition becomes true. In a loop therefore you need a counter to check the condition. JavaScript supports two types of loops:

 

·        For loop: The For loop in JavaScript should be used when you need to perform certain initializations, then checks the condition, and enters the loop only after the condition is true. The counter or the other update statements are executed first time after the loop is executed once and then the condition is evaluated again. The loop executes till the condition returns 'false' and the loop stops.

 

Syntax

for (Initialization statements; Condition; Updation statements)

   {

      Statements...

   }

 

Example

<html>

<body>

<script type="text/javascript">

// This loop prints the table of four

for (var num1=0;num1<=10;num1++)

{

  document.write("4X",num1,"=",4*num1,"<BR>");

}

</script>

</body>

</html>

 

 

·        While loop: The While loop in JavaScript should be used when you need to execute a piece of code for an undetermined number of times. This loop can do all that a For loop can do but in a cluttered way. This loop checks for a condition and enters the loop if the condition is true and executes the loop till the condition returns 'false'. This loop also allows you to use the break and continue statements within loop.

 

Syntax

while (condition)

   {

   .statements...

   }

Example

<html>

<body>

<script type="text/javascript">

// This loop prints the table of four

 

var num1 = 0;

while (num1 <= 10)

{

 

  document.write("4X",num1,"=",4*num1,"<BR>");

  num1++;

 

}

</script>

</body>

</html>

 

Result of both the loops

 

 


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