mix().in()

mixin.js

/**
 * Author: Jeroen Ransijn
 * Date: August 5 2014
 * Pass functions as arguments
 */
function mix () {
	var args = Array.prototype.slice.call(arguments), argsLength = args.length;
	return {
		in: function (fn) {
			for (var i = 0; i < argsLength; i++) {
				args[i].call(fn);
			}
			return fn;
		}
	};
}

// Example A
var Events = function () {
	this.on = function () { return 'on'; };
	this.off = function () { return 'off'; };
	this.trigger = function () { return 'trigger'; };
};

var View = function () {};

mix(Events).in(View);

View.on(); // => 'on

// Example B
var Templating = function () {
	this.template = function () { return 'Love to hate the "smart" prefix'; };
};

var SmartMix = mix(Events, Templating);
var SmartView = function () {};

SmartMix.in(SmartView);

SmartView.template(); // => 'Love to hate the "smart" prefix'