A quick compareBy function for easy configurable array sorting, with specs below.

compare_by.js

function compareBy(){
    var props = arguments
    var numProps = arguments.length
    return function(one, other){
        for (var i = 0; i < numProps; i++){
            var asc = true
            var prop = props[i]
            if (prop.charAt(0) === '^') prop = prop.substring(1)
            if (prop.charAt(0) === '_'){
                asc = false
                prop = prop.substring(1)
            }
            var oneProp = one[prop]
            var otherProp = other[prop]
            if (oneProp > otherProp) return asc ? 1 : -1
            else if (oneProp < otherProp) return asc ? -1 : 1
        }
        return 0
    }
}

describe('compareBy', function(){

    it('sorts one prop', function(){
        var browsers = [
            {name: 'Firefox'},
            {name: 'Chrome'}
        ]
        expect(browsers.sort(compareBy('name'))).to.deep.equal([
            {name: 'Chrome'},
            {name: 'Firefox'}
        ])
    })

    it('sorts ascending (also is default)', function(){
        var browsers = [
            {name: 'Firefox'},
            {name: 'Chrome'}
        ]
        expect(browsers.sort(compareBy('^name'))).to.deep.equal([
            {name: 'Chrome'},
            {name: 'Firefox'}
        ])
    })

    it('sorts descending (also is default)', function(){
        var browsers = [
            {name: 'Chrome'},
            {name: 'Firefox'}
        ]
        expect(browsers.sort(compareBy('_name'))).to.deep.equal([
            {name: 'Firefox'},
            {name: 'Chrome'}
        ])
    })

    it('sorts two props', function(){
        var browsers = [
            {name: 'Firefox', version: 15},
            {name: 'Chrome', version: 20},
            {name: 'Chrome', version: 14}
        ]
        expect(browsers.sort(compareBy('^name', '_version'))).to.deep.equal([
            {name: 'Chrome', version: 20},
            {name: 'Chrome', version: 14},
            {name: 'Firefox', version: 15}
        ])
    })

})