How to sort a multidimensional array in JavaScript

Question

I generally post the code I have so far, but I have nothing on this one... :(

How would I go about re-ordering the following array so that I can base it on the value in the 'percentage' key, either low-to-high or high-to-low?

var data = [{
    "id": "q1",
    "question": "blah blah blah",
    "percentage": "32"
}, {
    "id": "q2",
    "question": "blah blah blah",
    "percentage": "23"
}, {
    "id": "q3",
    "question": "blah blah blah",
    "percentage": "11"
}, {
    "id": "q4",
    "question": "blah blah blah",
    "percentage": "3"
}, {
    "id": "q5",
    "question": "blah blah blah",
    "percentage": "6"
}]

That's not a multidimensional array. It's an array of objects. — Madara's Ghost
– Madara's Ghost, Commented May 31, 2012 at 5:50

Andreas Wong · Accepted Answer · 2012-05-31 05:48:38Z

5

A bit of correction, it's not a multidimensional array, it's an array of objects, you most likely mixed up the naming from PHP, for your question, use the optional function argument of sort to define your own sorting order.

data.sort(function(a, b) {
   return a.percentage - b.percentage;
})

// sorted data, no need to do data = data.sort(...);

http://jsfiddle.net/cEfRd/

answered May 31, 2012 at 5:48

Andreas Wong

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Community · Accepted Answer · 2017-05-23 12:15:57Z

4

Sorter generator, generalizing https://stackoverflow.com/users/135448/siganteng answer so that it works on any property

function  createSorter(propName) {
    return function (a,b) {
        // The following won't work for strings
        // return a[propName] - b[propName];
        var aVal = a[propName], bVal = b[propName] ;
        return aVal > bVal ? 1 : (aVal < bVal ?  - 1 : 0);

    };
}
data.sort(createSorter('percentage'));

edited May 23, 2017 at 12:15

CommunityBot

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answered May 31, 2012 at 5:55

Ruan Mendes

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xdazz · Accepted Answer · 2012-05-31 05:49:54Z

2

data.sort(function(a,b){return a.percentage - b.percentage});

The Ref.

answered May 31, 2012 at 5:49

xdazz

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