// UMD as of 14 May 2015 from github/umdjs/umd.
(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as an anonymous module.
        define([], factory);
    } else if (typeof exports === 'object') {
        // Node. Does not work with strict CommonJS, but
        // only CommonJS-like environments that support module.exports,
        // like Node.
        module.exports = factory();
    } else {
        // Browser globals (root is window)
        root.returnExports = factory();
    }
}(this, function () {

    function mixin(src, dst) {
        Object.keys(src).forEach(function (k) {
            if (typeof src[k] === "undefined") delete dst[k];
            else dst[k] = src[k];
        });
    }

    // Model-like entity (one that sends update event).
    // Uses jQuery-like (jQuery, zepto, ...) event mechanism.
    // Must set JQUpd.jQuery to the wrapper function
    // before actual use.
    function JQUpd() {
    }

    JQUpd.prototype.update = function (data) {
        mixin(data, this);
        JQUpd.jQuery(this).trigger("changed", data);
    };

    // View-like entity (one that observes changed event).
    // Uses jQuery-like (jQuery, zepto, ...) event mechanism.
    function JQChg() {
    }

    JQChg.prototype.observeModel = function (model) {
        var self = this;
        model.on("changed", function (ev, data) {
            self.modelChanged(data, this);
        })
    };

    return {
        JQUpd: JQUpd,
        JQChg: JQChg
    };
}));