JavaScript数组对2个属性进行排序

Question

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

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
}];

Initially, I needed to sort the array by priority so I did this:

garments.sort(function (a, b) {

    // By priority
    return a.priority - b.priority;
});

which was fine. But now, I have realised that if a garment is not designable, then it should be at the bottom of the array regardless of it's priority. Can anyone help me with the sort function so all non designable garments are at the bottom of the sort?

Answer 1

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

Answer 2

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>');