/*!
  Copyright (c) 2015 Jed Watson.
  Licensed under the MIT License (MIT), see
  http://jedwatson.github.io/classnames
*/
/* global define */

(function () {
	'use strict';

	var hasOwn = {}.hasOwnProperty;

	function classNames () {
		var classes = '';

		for (var i = 0; i < arguments.length; i++) {
			var arg = arguments[i];
			if (!arg) continue;

			var argType = typeof arg;

			if (argType === 'string' || argType === 'number') {
				classes += ' ' + arg;
			} else if (Array.isArray(arg)) {
				classes += ' ' + classNames.apply(null, arg);
			} else if (argType === 'object') {
				for (var key in arg) {
					if (hasOwn.call(arg, key) && arg[key]) {
						classes += ' ' + key;
					}
				}
			}
		}

		return classes.substr(1);
	}

	if (typeof module !== 'undefined' && module.exports) {
		module.exports = classNames;
	} else if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {
		// AMD. Register as an anonymous module.
		define(function () {
			return classNames;
		});
	} else {
		window.classNames = classNames;
	}
}());

/*!
  Copyright (c) 2015 Jed Watson.
  Licensed under the MIT License (MIT), see
  http://jedwatson.github.io/classnames
*/
/* global define */

(function () {
	'use strict';

	var hasOwn = {}.hasOwnProperty;

	function classNames () {
		var classes = [];

		for (var i = 0; i < arguments.length; i++) {
			var arg = arguments[i];
			if (!arg) continue;

			var argType = typeof arg;

			if (argType === 'string' || argType === 'number') {
				classes.push(arg);
			} else if (Array.isArray(arg)) {
				classes.push(classNames.apply(null, arg));
			} else if (argType === 'object') {
				for (var key in arg) {
					if (hasOwn.call(arg, key) && arg[key]) {
						classes.push(key);
					}
				}
			}
		}

		return classes.join(' ');
	}

	if (typeof module !== 'undefined' && module.exports) {
		module.exports = classNames;
	} else if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {
		// AMD. Register as an anonymous module.
		define(function () {
			return classNames;
		});
	} else {
		window.classNames = classNames;
	}
}());

use [].join over concatenation