Sorting the properties in a javascript object. #javascript, #sorting

property sorting.js

var obj = {
    car: 300,
    bike: 60,
    motorbike: 200,
    airplane: 1000,
    helicopter: 400,
    rocket: 8 * 60 * 60
};

var sortable = [];
for (var prop in obj)
    sortable.push([prop, obj[prop]]);

sortable.sort(function(a, b) { return a[0] > b[0]; });

var sorted = {};
for (var i = 0; i < sortable.length; i++) {
    sorted[sortable[i][0]] = sortable[i][1];
}