extend.js

/* extend
 * 
 * @param {object} from
 * @param {object} to
 * @param {Array} [ array ] - array of properties
 * 
 * using:
 *  extend(object_1, object_2); // clone object
 *  extend(object_1, object_2, ['foo', 'bar']); // take some properties
 *  
 */
function extend(from, to, array) 
{
	if (Array.isArray(array)) {
		var comment = null;

		array.forEach(function(item, index) {
			comment = item + '__comment';

			if (from[comment]) 
				to[comment] = from[comment];

			to[item] = from[item];
		});
	}
	else to = Object.create(from);
}