Question

153

Loop through associative array in reverse

rated 0 times [ 154] [ 1] / answers: 1 / hits: 23461 / 14 Years ago, thu, february 10, 2011, 12:00:00

I'm using a javascript associative array (arr) and am using this method to loop through it.

for(var i in arr) {

    var value = arr[i];

    alert(i =) + value);

}

The problem is that the order of the items is important to me, and it needs to loop through from last to first, rather than first to last as it currently does.

Is there a way to do this?

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trinityr

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3 Years ago

answered 14 Years ago carlton · Accepted Answer

Warning: this answer is ancient.

If you're here for a quick fix, kindly refer to the much better answer below.

^{Original answer retained, because reasons. See comments.}

Using a temporary array holding the keys in reverse order:

var keys = new Array();



for (var k in arr) {

    keys.unshift(k);

}



for (var c = keys.length, n = 0; n < c; n++) {

   alert(arr[keys[n]]);

}