Comparing Arrays

mattastic · #1 (**permalink**) January 26th, 2006, 12:51 PM

Hi,

I have two arrays, could anybody tell me how I can loop through them and see if a value appears in both?

Thankyou

richard.york · #2 (**permalink**) January 26th, 2006, 01:24 PM

This replicates in JavaScript the PHP function in_array().

Code:

function in_array($needle, $haystack)
{
    for (var $i in $haystack)
    {
         if ($haystack[$i] == $needle)
         {
              return true;
         }
    }
    return false;
}

See if a value appears in both:

Code:

for (var $i in $array1)
{
    if (in_array($array1[$i], $array2))
    {
         alert('value: ' + $array[$i] + ' appears in both $array1 and $array2');
    }
}

HTH!

Regards,
Rich

--
[http://www.smilingsouls.net]
Mail_IMAP: A PHP/C-Client/PEAR solution for webmail
Author: Beginning CSS: Cascading Style Sheets For Web Design

mattastic · #3 (**permalink**) January 27th, 2006, 05:48 AM

Hi,

Thanks for that.

I'm not sure how to modify that to fit in with my array's.

Here are my two array's:

Code:

var list1 = "1,2,3,5";
var valueArray1 = new Array();
valueArray1 = list1.split(',');

var list2 = "5,6,7,8";
var valueArray2 = new Array();
valueArray2 = list2.split(',');

Could you tell me where they go in your script?

Thanks for your time

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