How can I sort an indirect array with javascript?

Question

In my project, I need to sort an array that contain index of an other array (it\'s item). I\'ve search for many hours, but I did not find anyone with my problem.

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Answer 1

You need to return the delta. Otherwise the callback returns undefined for each call.

arr2.sort(function(a, b) {
    return arr[b] - arr[a];
});

For adding the right order, you need ot take the index from indices to address the right element and assign i as style order value.

function sort() {
    var array = [1, 4, 3, 4, 5, 6, 7, 8, 9],
        z = document.getElementsByClassName("triable");

    [...array.keys()]
        .sort((a, b) => array[b] - array[a])
        .forEach((v, i) => z[v].style.order = i);
}

sort


1
4
3
4
5
6
7
8
9