problem with logic keys

[stack13]

Hi. Have some troubles checking arrays length:

var holder = column = new Array ();
column[0] = new Array ();
column[0]["ID"] = 1;
column[0]["TITLE"] = "Revistas";
column[0]["DESCRIPTION"] = "Revistas Viejas";
column[0]["PUBLICATION_DATE_DAY"] = 1;
column[0]["PUBLICATION_DATE_MONTH"] = 1;
...

    for (var i=0; i < holder.length;i++) {
        if (holder[i].length) alert ("Voila!");
        ...
    }

The fact is I cant get into holder inner arrays by referring its logic key. However, if I call ...

alert (holder[i]["ID"]);

... can see its value normally.
What am I doing wrong?

[codegoboom]

It looks like the array's length is 0, so... (properties are not array members, btw).

[stack13]

Right. Length is 0. Array items have no properties. So, how do I loop them through?

[codegoboom]

Use a 'for... in...' loop.

[stack13]

Ok folks. The reason why I could not get through members is at the for statement. I should have used:

    for (var i =0;i < holder.length;i++) {
        h = holder[i];
        for (var k in h) {
            alert (h[k]);
        }
    }