objectInheritence.js

// with this extend method, the second object is created, but there is no object reference between them.

var extend = function(parent, child) {
	var i = 0,
		child = child || {},
		toStr = Object.prototype.toString,
		arrayRef = '[object Array]';

	for(i in parent) {
		if(parent.hasOwnProperty(i)) {
			if(typeof parent[i] === 'object') {
				child[i] = (toStr.call(parent[i]) === arrayRef) ? [] : {};
				extend(parent[i], child[i]);
			} else {
				child[i] = parent[i];
			}
		}
	}

	return child;
}

var father = {
	name: 'Adam',
	age: 37,
	someArray: [1,2,3],
	someObjetc: {
		one: 1,
		two: 2
	}
}

var child = extend(father);

child.someArray === father.someArray; // false