Draft Model for interacting with LocalStorage

drafts.js

var draft_model = (function () {
    var exports = {};

    // the key that the drafts are stored under.
    var KEY = "drafts";
    var ls = localstorage();
    ls.version = 1;

    function createKey () {
        // use the base16 of the current time + a random string to reduce
        // collisions to essentially zero.
        return new Date().getTime().toString(16) + "-" + Math.random().toString(16).split(/\./).pop();
    }

    function get () {
        return ls.get(KEY) || {};
    }
    exports.get = get;

    exports.getDraft = function (id) {
        return get()[id] || false;
    }

    function save (drafts) {
        ls.set(KEY, drafts);
    }

    exports.addDraft = function (draft) {
        var drafts = get();

        var id = fn.createKey();
        draft.updatedAt = new Date().getTime();
        drafts[id] = draft;
        save(drafts);

        return id;
    }

    exports.editDraft = function (id, draft) {
        var drafts = get();

        if (drafts[id]) {
            draft.updatedAt = new Date().getTime();
            drafts[id] = draft;
            save(drafts);
        }
    }

    exports.deleteDraft = function (id) {
        var drafts = get();

        delete drafts[id];
        save(drafts);
    }

    return exports;
}());

exports.draft_model = draft_model;