prototype inheritance, constructor design pattern

const_des_pat.js

function constructor(name) {
	new_obj = {};
	new_obj.__proto__ = constructor.prototype;
	new_obj.name = name;
	return new_obj;
}

constructor.prototype = {};
constructor.prototype.age = 9;

var obj = constructor('tim');

console.log(obj.name) // tim
console.log(obj.age)  // 9

obj.hasOwnProperty('name') // true
obj.hasOwnProperty('age') // false

obj.__proto__ = null;

console.log(obj.name) // tim
console.log(obj.age)  // undefined

obj.hasOwnProperty('name') // undefined
obj.hasOwnProperty('age') // undefined

obj.hasOwnProperty = 'eheh';

console.log(obj.hasOwnProperty) // eheh

function factory(name, age) {
	return { name, age }
}