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Ilya Kantor 2017-03-30 13:28:35 +03:00
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1-js/07-object-oriented-programming/08-class-patterns/article.md
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@ -16,7 +16,7 @@ The `class` construct will be described in the next chapter, but in JavaScript i
## Functional class pattern
The constructor function below can be considered a class according to the definition:
The constructor function below can be considered a "class" according to the definition:
```js run
function User(name) {
@ -60,9 +60,11 @@ let user = new User("John", new Date(2000,0,1));
user.sayHi(); // John
```
In this code variables `name`, `birthday` and the function `calcAge()` are internal, *private* to the object. They are only visible from inside of it. The external code that creates the `user` only can see a *public* method `sayHi`.
In this code variables `name`, `birthday` and the function `calcAge()` are internal, *private* to the object. They are only visible from inside of it.
In works, because functional classes provide a shared lexical environment (of `User`) for private variables and methods.
From the other hand, `sayHi` is the external, *public* method. The external code that creates `user` can access it.
This way we can hide internal implementation details and helper methods from the outer code. Only what's assigned to `this` becomes visible outside.
## Prototype-based classes