JavaScript For Loop

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Loops execute a block of code a specified number of times, or while a specified condition is true.
JavaScript Loops

Often when you write code, you want the same block of code to run over and over again in a row. Instead of adding several almost equal lines in a script we can use loops to perform a task like this.
In JavaScript there are two different kind of loops:

• for - loops through a block of code a specified number of times
• while - loops through a block of code while a specified condition is true

The for Loop

The for loop is used when you know in advance how many times the script should run.
Syntax

for (var=startvalue;var<=endvalue;var=var+increment)
{
code to be executed
}
Example

The example below defines a loop that starts with i=0. The loop will continue to run as long as i is less than, or equal to 5. i will increase by 1 each time the loop runs.


Note: The increment parameter could also be negative, and the <= could be any comparing statement.
Example

Similar Threads:

• JavaScript If...Else Statements
• JavaScript Operators
• JavaScript Where To
• JavaScript How To
• JavaScript Tutorial

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