Question

What I’m trying to do is re-order the multidimensional array based on the lengths of each of its arrays, highest to lowest.

var array0 = [9, 7, 1]    
var array1 = [2]
var array2 = [20, 3, 8, 11]
var array3 = [0, 6];

var multi = [array0, array1, array2, array3];

var multiLengths = [];

$(multi).each(function(i) { // for loop using jQuery
    multiLengths.push(this.length);
});
// multiLengths: 3,1,4,2

function sortDesc(a,b) { //sort in descending order
    return b - a;
}

multiLengths.sort(sortDesc);

// somehow re-order multi to be: [array2, array0, array3, array1]

So how would I reorder the ‘multi’ array based on the new sorted order of ‘multiLengths’? It’s difficult because the new order is created using the sort function, so I can’t really index the results of the sortedMulti array.

Answer 1

You can just use sort on multi directly:

multi.sort(function (a, b) {
    return b.length - a.length;
});