Remove duplicates from an array of objects in javascript using a function generator.

gistfile1.js

var data = [{
    author: "Stephen King",
    title: "It"
}, {
    author: "Anne Rice",
    title: "Exit to Eden"
}, {
    author: "Stephen King",
    title: "It"
}, {
    author: "Carl Sagan",
    title: "Contact"
}];

var dedup = function (proplist) {
    var found = [],
        props = proplist;
    return function _dedup(elm) {
        var key = "";
        $(props).each(function(i,prop) { key += elm[prop]; });
        if (found.indexOf(key) == -1) {
            found.push(key);
            return true;
        }
        return false;
    }
};

var unique_results = data.filter(dedup(['title', 'author']));