JavaScript sum multidimensional array element values

Question

I have the following array and I need to calculate the sum of the values per group. I can get the sum for each group for the first value at dataArr[1] of the array, but I need to also get the sum for the second value at dataArr[2] for each group in the array.

var dataArr = [    [
    "Group One",
    1,
    1
],
[
    "Group Four",
    0,
    1
],
[
    "Group Three",
    0,
    1
],
[
    "Group Three",
    1,
    0
],
[
    "Group Four",
    0,
    1
],
[
    "Group Two",
    2,
    1
],
[
    "Group Four",
    1,
    0
],
[
    "Group Three",
    0,
    1
],
[
    "Group Three",
    0,
    1
],
[
    "Group One",
    1,
    0
],
[
    "Group Three",
    0,
    1
],
[
    "Group Two",
    1,
    0
]
];

How to calculate the sum of the second value and generate a multidimensional array like the following:

[["Group One", 2, 1], ["Group Four", 1, 2], ["Group Three", 1, 4], ["Group Two", 3, 1]]

Below is my code inspired from here:

var result = [];

$(dataArr).each(function() {
    var key = this[0];
    var value = this[1];

    if (result[key]) {
        result[key] += value;       
    } else {
        result[key] = value;
    }
});

Answer 1

This proposal uses a temporary object for the reference to the result array.

var dataArr = [["Group One", 1, 1], ["Group Four", 0, 1], ["Group Three", 0, 1], ["Group Three", 1, 0], ["Group Four", 0, 1], ["Group Two", 2, 1], ["Group Four", 1, 0], ["Group Three", 0, 1], ["Group Three", 0, 1], ["Group One", 1, 0], ["Group Three", 0, 1], ["Group Two", 1, 0]],
    result = function (data) {
        var r = [], o = {};
        data.forEach(function (a) {
            if (!o[a[0]]) {
                o[a[0]] = [a[0], 0, 0];
                r.push(o[a[0]]);
            }
            o[a[0]][1] += a[1];
            o[a[0]][2] += a[2];
        });
        return r;
    }(dataArr);
    
document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');