Underscore helpers

gistfile1.js

__without:function (list, othersList) {
                var diff = _.chain(list)
                    .filter(function (item) {
                        return _.where(othersList,
                            {Name:item.Name}).length === 0;
                    })
                    .value();

                return diff;
            },
            __filter:function (l, o) {
                var same = _.chain(l)
                    .filter(function (item) {
                        return _.where(o, {Name:item.Name}).length > 0;
                    })
                    .value();

                return same;
            },