Lodash / Underscore sort object keys. Like _.sortBy(), but on keys instead of values, returning an object, not an array. Defaults to alphanumeric sort.

example.js

var obj = {b: 3, c: 2, a: 1};

_.sortKeysBy(obj);
// {a: 1, b: 3, c: 2}

_.sortKeysBy(obj, function (value, key) {
    return value;
});
// {a: 1, c: 2, b: 3}

sortKeysBy.js

_.mixin({
    'sortKeysBy': function (obj, comparator) {
        var keys = _.sortBy(_.keys(obj), function (key) {
            return comparator ? comparator(obj[key], key) : key;
        });
    
        return _.object(keys, _.map(keys, function (key) {
            return obj[key];
        }));
    }
});