Object Oriented

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# Object oriented programming

```js
var answer = {
	get: function fn1() {
		return this.val;
	},
	val: 42
};
```
#Polymorphism changing the function
To create an object there are two steps


```js
var firmAnswer = Object.create(answer);
firmAnswer.get = function fn2() {
	return answer.get.call(this) + "!!";
}
```

step 1 instatiate the object
step 2 insert the data

```js
firmAnswer.get(3.14);
var a = firmAnswer.get();
console.log(a)
```

#Prototypes
##Classical model

```js
function Answer(value) {
	this._val = value;
}

Answer.prototype.get = function fn1() {
	return this._val;
};

var lifeAnswer = new Answer(42);
lifeAnwer.get();

function FirmAnswer(value) {
	Answer.call(this, value);
}

FirmAnswer.prototype = Object.create(Answer.prototype);
FirmAnswer.prototype.constructor = FirmAnswer;
FirmAnswer.prototype.get = function fn2() {
	return Answer.prototype.get.call(this) + "!!";
}
var luckyAnswer = new FirmAnswer(7);
luckyAnswer.get();