HOME

JS Basic
JS HOME
JS Introduction
JS How To
JS Where To
JS Variables
JS If...Else
JS Switch
JS Operators
JS Popup Boxes
JS Functions
JS For Loop
JS While Loop
JS Break Loops
JS For...In
JS Events
JS Try...Catch
JS Throw
JS onerror
JS Special Text
JS Guidelines

JS Objects
JS Objects Intro
JS String
JS Date
JS Array
JS Boolean
JS Math
JS HTML DOM

JS Advanced
JS Browser
JS Cookies
JS Validation
JS Animation
JS Image Maps
JS Timing
JS Create Object
JS Summary

Examples/Quiz
JS Examples
JS Object Examples
JS DOM Examples
JS Quiz

JS References
JS Objects
JS HTML DOM

Selected Reading
Web Statistics
Web Glossary
Web Hosting
Web Quality

W3Schools Forum

Helping W3Schools

JavaScript For...In Statement

The for...in statement is used to loop (iterate) through the elements of an array or through the properties of an object.

Examples

For...In statement
How to use a for...in statement to loop through the elements of an array.

JavaScript For...In Statement

The for...in statement is used to loop (iterate) through the elements of an array or through the properties of an object.

The code in the body of the for ... in loop is executed once for each element/property.

Syntax

for (variable in object)
{
    code to be executed
}

The variable argument can be a named variable, an array element, or a property of an object.

Example

Using for...in to loop through an array:

<html>
<body>

<script type="text/javascript">
var x
var mycars = new Array()
mycars[0] = "Saab"
mycars[1] = "Volvo"
mycars[2] = "BMW"

for (x in mycars)
{
document.write(mycars[x] + "<br />")
}
</script>

</body>
</html>

Want To Be A Web Master?

If you want to be a Web Master, you will have to host your web site with an ISP (Internet Service Provider).

MaximumASP offers seven different configurations of dedicated servers to meet your Windows and .NET hosting needs. Hosted on our multi-tiered Enterprise Class network, these servers provide the performance, security and reliability you need to host your high end web sites and applications.

Visit MaximumASP

Jump to: Top of Page or HOME or Printer friendly page

W3Schools provides material for training only. We do not warrant the correctness of its contents. The risk from using it lies entirely with the user. While using this site, you agree to have read and accepted our terms of use and privacy policy.

W3Schools was converted to XHTML in December 1999

SITE SEARCH
About W3Schools W3Schools Forum

ASP.NET
Web Hosting

WEB HOSTING
$15 Domain Name Registration Save $20 / year!

UK Domain Names
UK Web Hosting
Alojamiento Web

Buy UK Domain Names
Register Domain Names

Cheap Domain Names
Cheap Web Hosting

Best Web Hosting

Bulk Domain Names

UK Web Hosting

PHP MySQL Hosting
Web Hosting UK

Top 10 Web Hosting

Web Hosting Providers

ASP.NET Web Hosting
3 Months Free!

Programming Forums
Windows Web Hosting

WEB BUILDING
XML Website Tools

Website Templates
Flash Templates
Website Builder
Internet Business Opportunity

Custom Programming

BEST Flash Templates

Web Design Forum
Programming Forum

FREE Trial or Demo
Web Content Manager
Forms,Web Alerts,RSS

HTML Exam

SHOPPING
UK Wholesalers UK Wholesale

ONLINE DEGREE
Advance Your Career with Drexel University Bachelor's & Master's Tech Degrees ONLINE