JavaScript array sort on 2 properties

Question

I have a JSON array of objects that looks something like this:

var garments [{
    name: \'Garment 1\',
    isDesignable: false,
    priority: 3
},{
    name: \'         


        

Answer 1

Solution with one line of code.

First build the difference between isDesignable and if the same apply the difference of priority as sort indicator.

var garments = [{
        name: 'Garment 1',
        isDesignable: false,
        priority: 3
    }, {
        name: 'Garment 2',
        isDesignable: false,
        priority: 1
    }, {
        name: 'Garment 3',
        isDesignable: true,
        priority: 3
    }, {
        name: 'Garment 4',
        isDesignable: true,
        priority: 2
    }, {
        name: 'Garment 5',
        isDesignable: true,
        priority: 4
    }];
// sort isDesignable first and then by priority ascending
garments.sort(function (a, b) {
    return b.isDesignable - a.isDesignable || a.priority - b.priority;
});
document.write('<pre>' + JSON.stringify(garments, 0, 4) + '</pre>');

// sort reversing the former sort order by sorting, not reversing
garments.sort(function (a, b) {
    return a.isDesignable - b.isDesignable || b.priority - a.priority;
});
document.write('<pre>' + JSON.stringify(garments, 0, 4) + '</pre>');

Answer 2

garments.sort(function (a, b) {
    if (a.isDesignable == b.isDesignable) {
        return a.priority - b.priority;
    } else if (a.isDesignable) {
        return -1;
    } else {
        return 1;
    }
});