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JavaScript For Loop

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In Java Script Loops are used to execute the same block of code a specified number of times or while a specified condition is true.
A D V E R T I S E M E N T

for Statement

A for loop repeats its specified condition until that condition becomes false. The JavaScript for loop is similar to the Java,C and C++ for loop. A for statement looks as follows:

for ([initialExpression]; [condition]; [incrementExpression])
statement
...............


When a for loop executes, the following occurs:

1. The initializing expression initialExpression, if any, is executed. This expression usually initializes one or more loop counters, but the syntax allows an expression of any degree of complexity. This expression can also declare variables.

2. The condition expression is evaluated. If the value of condition is false, the for loop terminates .If the value of condition is true, the loop statements execute. If the condition expression is omitted entirely, the condition is assumed to be true.

3. The statement executes. To execute multiple statements, use a block statement ({ ... }) to group those statements.

4. The update expression increment Expression, if there is one, executes, and control returns to step 2.


Example:1


<html>
     <body>
     <script type="text/javascript">
       var i=0
        for (i=0;i<=10;i++)
       {
         document.write("The number is " + i)
         document.write("<br />")
       }
       </script>
     </body>
  </html>

Explanation: The example defines a loop that start with i=0. The loop will continue to run as long as i is less than, or equal to 10. i will increase by 1 each time the loop runs.

The increment parameter could also be negative, and the less than & equal to (<=) could be any comparing statement.


Result


The number is 0
The number is 1
The number is 2
The number is 3
The number is 4
The number is 5
The number is 6
The number is 7
The number is 8
The number is 9
The number is 10


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Keywords:javascript tutorial, javascript for loop syntax, javascript for loop counter, javascript for loop scripts

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