compare-objects.js

function compareObjects(o1, o2) {
    var diff = {
        '+':[], // fields exists in o1, but not in o2
        '-':[] //fields exists in o2, but not in o1
    };
    for(var x in o1) {
        if(o1.hasOwnProperty(x) && !o2.hasOwnProperty(x)) {
            diff['+'].push(x);
        }
    }
    for(var x in o2) {
        if(o2.hasOwnProperty(x) && !o1.hasOwnProperty(x)) {
            diff['-'].push(x);
        }
    }

    return diff;
}