dictionary.js

var Dictionary = {
    new : function () {
        var ret = Object.create(this);
        ret.data = {};

        return ret;
    },

    set : function (key, value) {
        this.data[key] = value;
        return this;
    },

    get : function (key, def) {
        if (key in this.data) {
            return this.data[key];
        }
        return def;
    },

    remove : function (key) {
        delete this.data[key];
        return this;
    }
};